Benzoxazinone compound, preparation method therefor, herbicidal composition, and use

Abstract

The present invention belongs to the technical field of pesticides, and specifically relates to a benzoxazinone compound, a preparation method therefor, an herbicidal composition, and a use. The compound is as represented by general formula I: where R1 and R2 each independently represent halogen, or together form -CH2CH2-; R3 represents cycloalkyl, a heterocyclic group, alkylthio, alkoxy, or alkoxyalkyl; R4, R5, R6, and R7 each independently represent hydrogen, halogen, alkyl, or the like; and R8 represents hydrogen, alkyl, or the like. The compound has excellent herbicidal activity and crop safety.

Description

A benzoxazinone compound, its preparation method, herbicidal composition and application Technical Field

[0001] This invention belongs to the field of pesticide technology, specifically relating to a benzoxazinone compound, its preparation method, herbicidal composition, and application. Background Technology

[0002] Weed control is a crucial aspect of achieving efficient agriculture. Although a wide variety of herbicides are available on the market, the weed-control performance and crop selectivity of these known compounds are not entirely satisfactory. Furthermore, due to the expanding market, weed resistance, herbicide lifespan, economic considerations, and increasing environmental awareness, scientists need to continuously research and develop new, efficient, safe, economical herbicides with different modes of action. Summary of the Invention

[0003] This invention provides a benzoxazinone compound, its preparation method, herbicidal composition, and application. The compound exhibits excellent herbicidal activity and crop safety.

[0004] The technical solution adopted in this invention is as follows:

[0005] A benzoxazinone compound or a salt thereof, as shown in general formula I:

[0006] R1 and R2 represent halogens independently, or together form -CH2CH2-;

[0007] R3 represents cycloalkyl, heterocyclic, alkylthio, alkoxy, or alkoxyalkyl;

[0008] R4, R5, R6, and R7 each independently represent hydrogen, halogen, alkyl, alkenyl, alkynyl, cyano, nitro, cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the alkyl, alkenyl, or alkynyl group is optionally substituted by at least one group selected from halogen, cyano, nitro, cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2;

[0009] R8 represents hydrogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, alkoxyalkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclic, heterocyclic alkyl, or -N(R)2;

[0010] The aforementioned "cycloalkyl", "heterocyclic" or "aryl" may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, alkyl, alkenyl, ynyl, cycloalkyl, haloalkyl, haloalkenyl, haloynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R;

[0011] R independently represents hydrogen, alkyl, alkenyl, alkynyl, alkyl, alkenyl or alkynyl, cycloalkyl, cycloalkenyl, aryl, cyano or alkoxycarbonyl, cycloalkyl, cycloalkenyl, phenyl, or cycloalkyl, cycloalkenyl or phenyl substituted by at least one group selected from halogen, cyano, nitro, alkyl, haloalkyl, alkoxycarbonyl, alkylthio, alkylsulfonyl, alkoxy or haloalkoxy.

[0012] In one specific embodiment, R3 represents a C3-C8 cycloalkyl, heterocyclic, C1-C8 alkylthio, C1-C8 alkoxy, or C1-C8 alkoxy-C1-C8 alkyl.

[0013] R4, R5, R6, and R7 independently represent hydrogen, halogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, cyano, nitro, C3-C8 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the C1-C8 alkyl, C2-C8 alkenyl, or C2-C8 alkynyl is optionally substituted by at least one group selected from halogen, cyano, nitro, C3-C8 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2;

[0014] R8 represents hydrogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, halo-C1-C8 alkyl, halo-C2-C8 alkenyl, halo-C2-C8 alkynyl, C1-C8 alkoxy-C1-C8 alkyl, C3-C8 cycloalkyl, C3-C8 cycloalkyl-C1-C8 alkyl, aryl, aryl-C1-C8 alkyl, heterocyclic, heterocyclic-C1-C8 alkyl, or -N(R)2;

[0015] The aforementioned “C3-C8 cycloalkyl”, “heterocyclic” or “aryl” may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, C3-C8 cycloalkyl, halo-C1-C8 alkyl, halo-C2-C8 alkenyl, halo-C2-C8 alkynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R;

[0016] R independently represents hydrogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, C1-C8 alkyl, C2-C8 alkenyl, C3-C8 cycloalkyl, C3-C8 cycloalkenyl, aryl, cyano, or C1-C8 alkoxycarbonyl, or C1-C8 alkyl, C2-C8 alkenyl, C3-C8 cycloalkyl, C3-C8 cycloalkenyl, phenyl, or C3-C8 cycloalkyl, C3-C8 cycloalkenyl, nitro, C1-C8 alkyl, halogenated C1-C8 alkyl, C1-C8 alkoxycarbonyl, C1-C8 alkenyl, C1-C8 alkylsulfonyl, C1-C8 alkoxy, or halogenated C1-C8 alkoxy, or C3-C8 cycloalkyl, C3-C8 cycloalkenyl, or phenyl.

[0017] In another specific embodiment, R3 represents C3-C6 cycloalkyl, heterocyclic, C1-C6 alkylthio, C1-C6 alkoxy, or C1-C6 alkoxy-C1-C6 alkyl.

[0018] R4, R5, R6, and R7 independently represent hydrogen, halogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, cyano, nitro, C3-C6 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the C1-C6 alkyl, C2-C6 alkenyl, or C2-C6 alkynyl is optionally substituted by at least one group selected from halogen, cyano, nitro, C3-C6 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2;

[0019] R8 represents hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, halo-C1-C6 alkyl, halo-C2-C6 alkenyl, halo-C2-C6 alkynyl, C1-C6 alkoxy-C1-C6 alkyl, C3-C6 cycloalkyl, C3-C6 cycloalkyl-C1-C6 alkyl, aryl, aryl-C1-C6 alkyl, heterocyclic, heterocyclic-C1-C6 alkyl, or -N(R)2;

[0020] The aforementioned “C3-C6 cycloalkyl”, “heterocyclic” or “aryl” may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 ynyl, C3-C6 cycloalkyl, halogenated C1-C6 alkyl, halogenated C2-C6 alkenyl, halogenated C2-C6 ynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R;

[0021] R independently represents hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C1-C6 alkyl, C2-C6 alkenyl, C3-C6 cycloalkyl, C3-C6 cycloalkenyl, aryl, cyano, or C1-C6 alkoxycarbonyl, or C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C6 cycloalkyl, C3-C6 cycloalkenyl, phenyl, or C3-C6 cycloalkyl, C3-C6 cycloalkenyl, nitro, C1-C6 alkyl, halogenated C1-C6 alkyl, C1-C6 alkoxycarbonyl, C1-C6 alkenyl, C1-C6 alkylsulfonyl, C1-C6 alkoxy, or halogenated C1-C6 alkoxy, or C3-C6 cycloalkyl, C3-C6 cycloalkenyl, or phenyl.

[0022] In another specific embodiment, R3 represents C3-C6 cycloalkyl, heterocyclic, C1-C6 alkoxy, or C1-C6 alkoxy-C1-C6 alkyl.

[0023] In the definitions of compounds shown in the above general formulas and in all the following structural formulas, the technical terms used, whether alone or in compound terms, represent the following substituents: alkyl groups having more than two carbon atoms can be straight-chain or branched. For example, in the compound term "cycloalkylalkyl," the alkyl group can be -CH2-, -CH2CH2-, -CH(CH3)-, -C(CH3)2-, etc. The alkyl group is, for example, C1 alkyl-methyl; C2 alkyl-ethyl; C3 alkyl-propyl such as n-propyl or isopropyl; C4 alkyl-butyl such as n-butyl, isobutyl, tert-butyl, or 2-butyl; C5 alkyl-pentyl such as n-pentyl; C6 alkyl-hexyl such as n-hexyl, isohexyl, and 1,3-dimethylbutyl. Similarly, alkenyl groups are, for example, vinyl, allyl, 1-methylprop-2-en-1-yl, 2-methylprop-2-en-1-yl, but-2-en-1-yl, but-3-en-1-yl, 1-methylbut-3-en-1-yl, and 1-methylbut-2-en-1-yl. Alkynyl groups are, for example, ethynyl, propynyl, but-2-yn-1-yl, but-3-yn-1-yl, and 1-methylbut-3-yn-1-yl. Multiple bonds can be in any position in each unsaturated group. Cycloalkyl groups are carbocyclic saturated ring systems having, for example, three to six carbon atoms, such as cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl. Similarly, cycloalkenyl groups are monocyclic alkenyl groups having, for example, three to six carbon ring members, such as cyclopropenyl, cyclobutenyl, cyclopentenyl, and cyclohexenyl, wherein double bonds can be in any position. Halogens are fluorine, chlorine, bromine, or iodine.

[0024] Unless otherwise specified, the term "aryl" in this invention includes, but is not limited to, phenyl, naphthyl, and... The "heterocyclic group" includes, but is not limited to, saturated or unsaturated non-aromatic cyclic groups. And, including but not limited to, heteroaryl groups, i.e., aromatic cyclic groups containing, for example, 3 to 6 ring atoms and optionally fused with benzo[a] rings, wherein 1 to 4 (e.g., 1, 2, 3, or 4) heteroatoms are selected from oxygen, nitrogen, and sulfur, for example

[0025] The terms "optional" or "optionally" mean that the event or situation described below may or may not occur, and the description includes instances where said event or situation occurs and instances where said event or situation does not occur. For example, the term "optionally...substituted" means that the specified atom or group is unsubstituted or substituted by one or more substituents. If a group is substituted by a group, this should be understood to mean that the group is substituted by one or more groups, either the same or different, selected from those groups mentioned. Furthermore, the same or different substitution characters contained in the same or different substituents are chosen independently and may be the same or different. This also applies to ring systems formed from different atoms and units. Meanwhile, the scope of the claims excludes compounds that are chemically unstable under standard conditions, as known to those skilled in the art.

[0026] Furthermore, unless otherwise specified, the phrase "replaced by at least one group" in this invention refers to being replaced by, for example, 1, 2, 3, 4, or 5 groups; groups without specific attachment positions (including heterocyclic groups, aryl groups, etc.) can be attached at any position, including positions attached to C or N; if it is substituted, the substituent can also be substituted at any position, as long as it conforms to the rules of chemical bond attachment. For example, a heteroaryl group substituted by one methyl group. Can represent wait.

[0027] If various functional groups are present, the present invention also includes any ketone and enol tautomer forms, mixtures thereof, and salts thereof.

[0028] Stereoisomers can be obtained from mixtures prepared by optical resolution. Similarly, stereoisomers can be selectively prepared using stereoselective reactions and optically active starting materials and / or auxiliaries. For optical resolution, conventional methods (see Textbooks of Stereochemistry) can generally be used, such as physical methods for resolving mixtures into diastereomers, including crystallization, chromatography, especially column chromatography and high-performance liquid chromatography, distillation under reduced pressure as needed, extraction, and other methods, typically employing chromatographic separation on a chiral solid phase, which can separate the residual mixture of enantiomers. Suitable for preparative or industrial scales are methods such as crystallizing diastereomers, which can be obtained from the compound using optically active acids, and, if acidic groups are present, using optically active bases as needed.

[0029] The method for preparing a benzoxazinone compound or its salt includes the following steps:

[0030] (1) When R8 is hydrogen, the compound represented by general formula II is reacted with an azide reagent to give the compound represented by general formula I-1. The reaction equation is as follows:

[0031] In one specific embodiment, the reaction (1) is carried out in the presence of a base and a solvent.

[0032] In another specific embodiment, the base is selected from at least one of inorganic or organic bases, such as K2CO3, Na2CO3, Cs2CO3, NaHCO3, KF, CsF, KI, NaI, KOAc, AcONa, K3PO4, t-BuONa, EtONa, NaOH, KOH, NaOMe, NaH, KH, DMAP, pyrazole, triethylamine, DIEA, etc.

[0033] In another specific embodiment, the azide reagent is selected from at least one of DPPA, diphenylphosphonic chloride and sodium azide, ethyl azidoacetate or tributyltin azide.

[0034] In another specific embodiment, the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, toluene, or ethyl acetate.

[0035] In another specific embodiment, the reaction temperature is 100–120°C.

[0036] (2) When R8 is CHF2, the compound represented by general formula I-1 reacts with the compound represented by general formula III, and after decarboxylation, gives the compound represented by general formula I-2. The reaction equation is as follows:

[0037] (3) When R8 is CHF2, the compound represented by general formula I-1 reacts with the compound represented by general formula V to give the compound represented by general formula I-2. The reaction equation is as follows:

[0038] In one specific embodiment, both reactions (2) and (3) are carried out in the presence of a base and a solvent.

[0039] In another specific embodiment, the base is selected from at least one of inorganic or organic bases, such as K2CO3, Na2CO3, Cs2CO3, NaHCO3, KF, CsF, KI, NaI, KOAc, AcONa, K3PO4, t-BuONa, EtONa, NaOH, KOH, NaOMe, NaH, KH, DMAP, pyrazole, triethylamine, DIEA, etc.

[0040] In another specific embodiment, the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, chloroform, toluene, or ethyl acetate.

[0041] In another specific embodiment, the reaction (2) is carried out at a temperature of 100–130°C.

[0042] (4) When R8 is R8', the compound represented by general formula I-1 reacts with the compound represented by general formula IV to give the compound represented by general formula I-3. The reaction equation is as follows:

[0043] In one specific embodiment, the reaction (4) is carried out in the presence of a base and a solvent.

[0044] In another specific embodiment, the base is selected from at least one of inorganic or organic bases, such as K2CO3, Na2CO3, Cs2CO3, NaHCO3, KF, CsF, KI, NaI, KOAc, AcONa, K3PO4, t-BuONa, EtONa, NaOH, KOH, NaOMe, NaH, KH, DMAP, pyrazole, triethylamine, DIEA, etc.

[0045] In another specific embodiment, the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, toluene, or ethyl acetate.

[0046] Wherein, Hal represents halogen, W1 and W2 independently represent C1-C6 alkyl groups, and R8' represents groups other than hydrogen and CHF2 in R8; the definitions of R1, R2, R3, R4, R5, R6, R7 and R8 are as described above.

[0047] In addition, the compounds described in this invention can be prepared by referring to the methods shown in CN103221409B, etc.

[0048] The present invention also provides an intermediate, as shown in Formula II.

[0049] A herbicide composition comprising a herbicidally effective amount of at least one of the benzoxazinone compounds or their salts; preferably, it further comprises a formulation adjuvant; more preferably, it further comprises other active ingredients.

[0050] A method for controlling weeds, comprising applying a herbicidal amount of at least one of the benzoxazinone compounds or salts thereof, or the herbicide composition thereof, to plants or weedy areas.

[0051] The use of at least one of the benzoxazinone compounds or their salts, or the herbicide composition thereof, in controlling weeds, preferably, the use of the benzoxazinone compounds or their salts in controlling weeds in useful crops, said useful crops being transgenic crops or crops treated with genome editing technology.

[0052] For many economically important monocotyledonous and dicotyledonous pests, the compounds of Formula I of this invention exhibit outstanding herbicidal activity. The active substances of this invention are also effective against perennial weeds that grow from rhizomes, rootstocks, or other perennial organs and are difficult to control. In this regard, it is generally not important whether the substance is used before sowing, before germination, or after germination. Representative examples of monocotyledonous and dicotyledonous weed populations that can be controlled by the compounds of this invention are specifically mentioned, without limiting the specific species. Examples of weed species to which the active substances are effective include monocotyledons: annuals of *Oat*, *Lolium*, *Alopecurus*, *Fararis*, *Barnyardgrass*, *Digitaria*, *Setaria*, and *Sedge*, and perennials of *Agrostis*, *Cynodon*, *Imperata*, and *Sorghum*, as well as perennials of *Sedge*.

[0053] Regarding dicotyledonous weed species, its effects can be extended to annual species such as *Galium aparine*, *Viola*, *Veronica*, *Sesamum indicum*, *Stellaria*, *Amaranthus*, *Sinapis*, *Ipomoea*, *Heliotropium*, *Chaenomeles*, and *Abutilon*, and perennial weeds such as *Convolvulus*, *Thistle*, *Rumex*, and *Artemisia*. The active substances of this invention effectively control harmful plants such as barnyard grass, *Sagittaria*, *Alisma*, *Eupatorium*, *Sedum*, and *Sedge* under the undetermined condition of rice sowing. If the compounds of this invention are applied to the soil surface before germination, weed seedlings can be completely prevented before they emerge, or growth can be stopped when the weeds develop cotyledons, eventually leading to their complete death after three to four weeks. The compounds of this invention exhibit particularly excellent activity against the following plants: *Apira*, *Sesamum indicum*, *Polygonum cuspidatum*, *Stellaria*, *Veronica ivy*, *Veronica arabiculata*, *Viola tricolor* and *Amaranthus*, *Galium aparine*, and *Kochia scoparia*.

[0054] While the compounds of this invention exhibit excellent herbicidal activity against both monocot and dicot weeds, they cause little to no damage to important economic crops such as wheat, barley, rye, rice, corn, sugar beets, cotton, and soybeans. They are particularly compatible with cereal crops, such as wheat, barley, and corn, especially wheat. Therefore, the compounds of this invention are highly suitable for the selective control of unwanted plants in agricultural or ornamental crops.

[0055] Due to their herbicidal properties, these active substances can be used to control harmful plants in known or future genetically engineered plant cultivation. Transgenic plants typically possess superior traits, such as resistance to specific pesticides, particularly herbicides, and resistance to plant diseases or pathogenic microorganisms, such as specific insects or fungi, bacteria, or viruses. Other specific traits relate to conditions such as quantity, quality, storage stability, composition, and special components of the product. Thus, it is known that transgenic plant products have increased starch content or improved starch quality or different fatty acid compositions.

[0056] The compounds of Formula I of the present invention, or salts thereof, are preferably used in the cultivation of economically important genetically modified crops and ornamental plants, such as cereals, including wheat, barley, rye, oats, millet, rice, cassava, and corn, or in the cultivation of sugar beets, cotton, soybeans, rapeseed, potatoes, tomatoes, peas, and other vegetable plants. The compounds of Formula I are preferably used as herbicides for the cultivation of useful plants that are resistant or have been genetically engineered to resist the toxic effects of the herbicides.

[0057] Traditional methods for breeding plants with improved traits than known plants include, for example, conventional mating methods and mutant breeding. In other words, new plants with improved traits can be obtained using genetic engineering methods (see, for example, EP-0221044A, EP-0131624A). Several methods have been described, for example:

[0058] - To improve starch synthesis in plants, genetic engineering is used to modify crop plants (e.g., WO 92 / 11376, WO92 / 14827, WO 91 / 19806);

[0059] - Transgenic crop plants resistant to specific herbicides, such as glufosinate-methyl (e.g., EP-0242236A, EP-0242246A), glyphosate-based herbicides (WO 92 / 00377), or sulfonylurea herbicides (EP-0257993A, US-5013659A);

[0060] - For example, genetically modified cotton plants can produce Bt toxins, which can defend against certain pests (EP-0142924A, EP-0193259A).

[0061] - A genetically modified crop plant with improved fatty acid composition (WO91 / 13972).

[0062] Many molecular biotechnologies for preparing transgenic plants with improved traits are known (see, for example, Sambrook et al., 1989, Molecular Amplification, Laboratory Manual, 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, New York; or Winnacker, “Gene and Cloning,” VCH Weinheim, 2nd ed., 1996; or Christou, “Trends in Plant Science,” 1 (1996) 423-431). To perform genetic engineering operations, nucleic acid molecules may be introduced into plasmids, resulting in mutations or sequence alterations through DNA sequence recombination. Using standard methods, such as base substitution, removal of portions of the sequence, or addition of natural or synthetic sequences, can be employed. To link DNA fragments together, it is possible to attach conjugates or linkers to the fragments.

[0063] Plant cells containing reduced-activity gene products can be prepared by methods such as expressing at least one appropriate antisense RNA or sense RNA to achieve co-inhibition, or by expressing at least one appropriately constructed ribozyme that specifically cleaves the transcript of the aforementioned gene product.

[0064] For this purpose, it is possible to use a DNA molecule containing the entire coding sequence of the gene product, including any possible flanking sequences, or a DNA molecule containing only a portion of the coding sequence, which must be long enough to achieve an antisense effect in the cell. Alternatively, a sequence that is highly homologous to but not identical to the coding sequence of the gene product can also be used.

[0065] When nucleic acid molecules are expressed in plants, the synthesized proteins can be localized in any desired plant cell compartment. However, to localize in a specific compartment, it is possible, for example, to link the coding region to a DNA sequence to ensure localization at a specific location. These sequences are known to those skilled in the art (see, for example, Braun et al., EMBO J.11 (1992) 3219-3227; Wolter et al., Proc. Natl. Acad. Sci. USA 65 (1988), 846-850; Sonnewald et al. Plant J.1 (1991), 95-106).

[0066] Using known techniques, transgenic plant cells can be recombined into the entire plant. Transgenic plants can be any desired plant variety, i.e., monocots and dicots. In this way, it is possible to obtain transgenic plants with improved traits by overexpressing, inhibiting or suppressing homologous (=natural) genes or gene sequences, or by expressing heterologous (=external) genes or gene sequences.

[0067] When the active substances of this invention are used on genetically modified crops, in addition to the inhibitory effect on harmful plants observed in other crops, they often exhibit specific effects on the corresponding genetically modified crops. For example, they can improve or expand the range of weed control, improve the application rate, preferably combine the herbicide resistance of the genetically modified crop with the performance of the herbicide, and affect the growth and yield of the genetically modified crop. Therefore, this invention also provides the use of the compounds as herbicides to control harmful plants in genetically modified crop plants.

[0068] Furthermore, the compounds of this invention can significantly regulate crop growth. By modulating plant metabolism, these compounds can be used to directionally control plant components and promote harvesting, for example, by causing plant drying and dwarfing. They are also suitable for regulating and inhibiting unwanted plant growth without disrupting crop growth. Inhibiting plant growth plays a crucial role in many monocot and dicot crops because it can reduce or completely prevent lodging.

[0069] The compounds of the present invention can be applied using common formulations, including wettable powders, concentrated emulsions, sprayable solutions, powders, or granules. Thus, the present invention also provides herbicide compositions comprising compounds of formula I. Compounds of formula I can be formulated in various ways depending on typical biological and / or chemical physical parameters. Examples of suitable formulation choices include: wettable powders (WP), water-soluble powders (SP), water-soluble concentrates, concentrated emulsions (EC), emulsions such as oil dispersed in water and water dispersed in oil (EW), sprayable solutions, suspension concentrates (SC), dispersible oil suspensions (OD), suspensions diluted with oil or water, solutions miscible with oil, powders (DP), capsule suspensions (CS), seeddressing compositions, granules for broadcasting and soil application, spray granules, coating granules and absorbent granules, water-dispersible granules (WG), water-soluble granules (SG), ULV (ultra-low volume) formulations, microcapsules, and wax products. These individual formulation types are known and described in the following literature, for example, Winnacker-Küchler, “Chemische Techonologie” [Chemical Processes], Vol. 7, C. Hauser Verlag Munich, 4th ed. 1986; Wade van Valkenburg, “Pesticide Formulations”, Marcel Dekker, NY, 1973; K. Martens, “Spray Drying” Handbook, 3rd ed. 1979, G. Goodwin Ltd. London.

[0070] Necessary formulation adjuvants, such as inert substances, surfactants, solvents, and other additives, are also known and described in the following documents, for example, Watkins's "Handbook of Powder Diluents, Insecticides, and Carriers," 2nd ed., Darland, Caldwell, NJ; Hv01phen's "Introduction to Clay Colloid Chemistry," 2nd ed., J. Wiley and Sons, NY; C. Marsden's "Solvent Guide," 2nd ed., Interscience, NY 1963; McCutcheon's "Annual Report on Detergents and Emulsifiers," MC Publishing, Ridgewood, NJ; Sisley and Wood, "Encyclopedia of Surfactants," Chemical Publishing, NY 1964; of [Ethylene oxide adduct surfactants], Wiss. Verlagagesell. Stuttgart 1976; Winnacker-Küchler, “Chemische Technologie” [Chemical Processes], Vol. 7, C. Hauser Verlag Munich, 4th edition 1986.

[0071] Wettable powders are uniformly dispersible in water and, in addition to the active ingredient, include diluents or inert substances, ionic and nonionic surfactants (wetting agents, dispersants), such as polyethoxyalkylphenols, polyethoxy fatty alcohols, polyoxyethyl aliphatic amines, fatty alcohol polyethylene glycol ether sulfates, alkyl sulfonates, alkyl phenyl sulfonates, sodium lignosulfonate, sodium 2,2'-dinaphthylmethane-6,6'-disulfonate, sodium dibutylnaphthalenesulfonate, or sodium oleoylmethyl taurate. To prepare wettable powders, the active ingredient of the herbicide is finely ground, for example using common equipment such as hammer mills, fan mills, and jet mills, while adjuvants are mixed in simultaneously or sequentially.

[0072] Concentrated emulsions are prepared by dissolving active ingredients in an organic solvent, such as butanol, cyclohexanone, dimethylformamide, xylene, or a mixture of higher-boiling aromatic compounds or hydrocarbons, and then adding one or more ionic and / or nonionic surfactants (emulsifiers). Examples of emulsifiers that can be used include, for example, calcium alkylaryl sulfonate of calcium dodecylbenzenesulfonate, or nonionic emulsifiers such as fatty acid polyethylene glycol esters, alkyl aromatic polyethylene glycol ethers, fatty alcohol polyethylene glycol ethers, propylene oxide-ethylene oxide condensation products, alkyl polyethers, sorbitan esters such as sorbitan fatty acid esters, or polyethylene oxide sorbitan esters such as polyethylene oxide sorbitan fatty acid esters.

[0073] The active substance and finely ground solid material are ground to obtain a powder. The solid material may be talc, natural clay such as kaolin, bentonite, and pyrophyllite, or diatomaceous earth. A water- or oil-based suspension may be prepared, for example, by wet grinding using a commercially available glass bead mill, with or without the addition of a surfactant of the other formulation type mentioned above.

[0074] Emulsions, such as oil-in-water (EW) emulsions, can be prepared using an aqueous organic solvent, a stirrer, a colloid mill, and / or a static mixer, and if necessary, by adding a surfactant of another formulation type as described above.

[0075] Granules can be prepared by spraying the active material onto an adsorbent and granulating it using an inert material, or by concentrating the active material onto the surface of a carrier such as sand or kaolinite and granulating it using a binder such as polyvinyl alcohol, sodium polyacrylate, or mineral oil. Suitable active materials can be granulated using methods for preparing fertilizer granules, and fertilizers can be mixed in if necessary. Aqueous suspension granules can be prepared using conventional methods such as spray-drying, fluidized bed granulation, disc granulation, mixing using a high-speed mixer, and extrusion without solid inert material.

[0076] For methods of preparing granules using milling discs, fluidized beds, extruders, and spraying, see the following processes, for example, “Spray Drying Handbook,” 3rd edition, 1979, G. Goodwin Ltd., London; J.E. Browning, “Agglomeration,” Chemicals and Engineering, 1967, 147ff; “Perry’s Chemical Engineer’s Handbook,” 5th edition, McGraw-Hill, New York, 1973, 8–57. For information on formulations of crop protection products, see, for example, G.K. C. Lingman, “Weed Control as a Science,” John Wiley and Sons, New York, 1961, 181–96; and JD. F. Greyer, SAEvans, “Weed Control Handbook,” 5th edition, Blackwell Scientific Rublications, Oxford University Press, 1968, 101–103.

[0077] Agricultural chemical formulations typically contain 0.1% to 99%, particularly 0.1% to 95%, of active ingredient Formula I by weight. The concentration of active ingredient in wettable powders is, for example, from about 10% to 99% by weight, with the usual formulation components constituting the remainder to 100% by weight. The concentration of active ingredient in concentrated emulsions can be from about 1% to 90% by weight, preferably 5% to 80%. Powder formulations contain 1% to 30% active ingredient by weight, typically preferably 5% to 20% by weight; however, sprayable solutions contain about 0.05% to 80% by weight, preferably 2% to 50% by weight. The content of active ingredient in aqueous suspension granules depends primarily on whether the active ingredient is liquid or solid, and on the adjuvants, fillers, etc., used during granulation. The content of active ingredient in aqueous suspension granules is, for example, between 1% and 95% by weight, preferably between 10% and 80% by weight.

[0078] The formulation of the active substance may also include thickeners, wetting agents, dispersants, emulsifiers, penetrants, preservatives, antifreeze agents, solvents, fillers, carriers, colorants, defoamers, evaporation inhibitors, and pH and viscosity adjusters that are commonly used in all cases.

[0079] Based on these formulations, they may also be mixed with other pesticide active substances such as insecticides, acaricides, herbicides and fungicides, as well as with safeners, fertilizers and / or plant growth regulators. The mixing method may be pre-mixed or bottled.

[0080] Suitable active substances that can be mixed with the active substances of the present invention in compound formulations or tank-mixed formulations include, for example, known substances in the "World Encyclopedia of New Pesticide Varieties Technology", China Agricultural Science and Technology Press, 2010.9 and the literature cited herein. For example, the following herbicidal active substances can be mixed with compounds of Formula I (Note: the name of the compound is either the common name according to the International Organization for Standardization (ISO) or the chemical name, with a code where appropriate): acetochlor, butachlor, metolachlor, isopropachlor, isopropachlor, succinyl-metolachlor, propachlor, chlorpyrifos, chlorpyrifos, naphthalenepropanoyl-methyl, R-L-naphthalenepropanoyl-methyl, propargyl, benzylthiamethoxam, bisbenzyl-methyl, pyrifluquinazon, chlorpyrifos, flubutyroxychlor, brobutyroxychlor, dimethoate, high-efficiency dimethoate, ethoxybenzyl-methyl, flubutyroxychlor, methoxythiamethoxam, pyrifluquinazon, isoxachlor, high-efficiency methylparaben, high-efficiency methylparaben. Acetaminophen, clethodim, butyrazosulfuron, cyprochloraz, flusulfuron, heptanosulfuron, isobutyrazosulfuron, propyzamide, terbutyrazosulfuron, methylparaben, metolachlor, methylcyclohexane, chlorpyrifos, propyzamide, pendimethalin, carbaryl, succinylmethrin, tricyclomethrin, butyrazosulfuron, succinylmethrin, bensulfuron-methyl, naphthylmethrin, acetochlor, naphthylmethrin, thiamethoxam, pyrimethanil, bensulfuron-methyl, chlorpyrifos, butyrazosulfuron, flupyrazole, atrazine, simazine, promethazine, cypermethrin, cypermethrin, atrazine, pyrazosulfuron, isopropazine, flumethrin, terbutyraz, terbutyraz, triazine flumethrin, cyprochlorazine, glyphosate, chlorpyrifos Phosphatidylcholine, Simazine, Ziziphus jujuba, Dichlorvos, Isoamyl acetate, Cyprodinil, Atrazine, Butyraz, Butyraz, Terbutaline, Methoxypropazine, Cypermethrin, Herbicides, Clonazine, Atrazine, Methoxypropazine, Glycyrrhizin, Cyanobacterium trioxide, Indaziflam, Greensulfuron, Methsulfuron-methyl, Benzylsulfuron, Chlorpyrifos, Bensulfuron-methyl, Thisulfuron-methyl, Pyrimisulfuron-methyl, Methiosulfuron-methyl, Sodium formamide sulfuron, Ethersulfuron-methyl, Etherbensulfuron-methyl, Methsulfuron-methyl, Nicosulfuron-methyl, Aminosulfuron-methyl, Acylsulfuron-methyl, Ethoxysulfuron-methyl, Cyprosulfuron-methyl, Sulfadiazine, Tetraazolidinylsulfuron, Pyrimisulfuron, Monosulfuron-methyl, Fluazolidinylsulfuron, Flupyrimisulfuron, Flupyrimisulfuron, Epimethrin Sulfuric acid, pyrazosulfuron, flusulfuron, propanil, trifluprosulfuron, sulfonylsulfuron, trifluralin, flusulfanil, trifluralin, mesosulfuron sodium salt, flupyrsulfuron, thiosulfuron, pyrimethanil, propyrisulfuron, pyrazosulfuron, trifluralin, flusulfanilamide, quizalofop-p-ethyl, ethoxysulfuron, glufosinate, bensulfuron, chlorfluazuron ethyl, methylfluzoxystrobin, trifluralin, methoxysulfuron, trifluralin, flufenoxuron, flufenoxuron, oxysulfuron, metolachlor, sulfadiazine, flufenoxuron, oxysulfuron, metolachlor, flufenoxuron, flufenoxuron, halosafen, chlormequat chloride, isoproturon, linuron, diuronSaprolegnia, fluroxypyr, bensulfuron, methyl bensulfuron, bensulfuron, sulfothiamethoxam, isoxaflutole, terbutaline, clodinafop-methyl, chlorobromosulfuron, methyl methoxysulfuron, methyl methoxysulfuron, bromosulfuron, methoxysulfuron, chlorpyrifos, metribuzin, cycloroxysulfuron, felsulfuron, flusulfuron, glufosinate, fensulfuron, cyproconazole, thiamethoxam, fensulfuron, chlorpyrifos, methamidophos, thiamethoxam, trimethourea, oxazolium, Monisouron, Anisuron, Methiuron, Chloreturon, tetraflufenozide, betaine, betaine-ethyl, betaine, sulfonamide, terbutaline, fensulfuron-methyl, fensulfuron-methyl, fensulfuron-methyl, fensulfuron-methyl, chlorpyrifos, carboxazo le, Chlorprocarb, Fenasulam, BCPC, CPPC, Carbasulam, Butyrazosulfan, Clethodim, Metrazine, Clethodim, Wild Grass, Permethrin, Clethodim, Barnyardgrass, Cypermethrin, Oat Grass, Dimethoate, Ethylmethazine, Methiobencarb, Clethodim, Benzoate, Methiobencarb, Thionylmethazine, Methiobencarb, 2,4-D Butyl Acetate, 2,4-D Sodium Chloride, 2,4-D Isooctyl Acetate, 2,4-D Sodium Salt, 2,4-D Dimethylamine Salt, 2,4-D Chlorethyl Thiate, 2,4-D Chloride, 2,4-D Propionic Acid, High 2,4-D Propionate, 2,4-D Butyric Acid, 2,4-D Chlorpropionic Acid, 2,4-D Propionate 2,4,5-chlorobutyric acid, 2,4,5-propylpropionic acid, 2,4,5-propylbutyric acid, 2,4,5-chloromethacin, MCPA, dicamba, quizalofop-p-ethyl, cyhalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, cyhalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl, quizalofop-p-ethyl In, proponitrophenol, glyphosate, barnyardphos, glufosinate, methyl parathion, glyphosate, piperazine, diammonium phosphate, dimethoate, phosmet, fenpropathrin, fenpropathrin, fenpropathrin, dimethoate, fenpropathrin, imidacloprid, imidacloprid acetic acid, imidacloprid quinolinic acid, methoxymethylene, methoxymethylene ammonium salt, imidacloprid acetic acid, imidacloprid, clopyralid, clopyralid isooctyl ester, dichloropyridine acid, aminopyridine acid, trichloropyridine acid, fluthion, haloxypyridine, trichloropyridine phenol, thiamethoxam, flupyridine, clopyralid, flupyridine hydrazone, trichloropyridine butoxyethyl ester, cliodinate, clethodim, thiamethoxam, quizalofop-p-ethyl, cyclobenzanone, butenazine, oxadiazine, pyranazine, buthidazole, cyproconazoleAmetridione, Amibuzin, bromobenzonitrile, octanoyl bromobenzonitrile, octanoyl iodobenzonitrile, iodobenzonitrile, diphenylacetonitrile, bispyribac-sodium, hydroxybispyribac-sodium, Iodobonil, pyrimisulfuron-methyl, diflubenzuron, penoxsulam, sulfadiazine, chlorpyrifos-sulfuron-methyl, dichlorvos-sulfuron-methyl, fluroxypyr, bispyribac-sodium, pyrimisulfuron-methyl, pyrimisulfuron-methyl, pyrimisulfuron-methyl, bispyribac-sodium, nicosulfuron-methyl, sulfadiazine, Tembotrione, Tefuryltrione, Bicyclopyrone, Ketospiradox, isoxazinone, isoxazinone, Fenoxasulfone, Me thiozolin, isopropalazine, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, bensulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, flumetsulam, pyrazosulfuron, pyrazosulfuron, flumethrin, mesotrione, pyrazosulfuron, flupropalazine, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, flupropalazine, pyrazosulfuron, flupropalazine, pyrazosulfuron, flupropalazine, pyrazosulfuron, flumezin, pentachlorophenol (sodium), terliphenol, terliphenol, terliphenol, pentonitrophenol, dinitrophenol, chlorpyrifos, terlisulfuron, terlisulfuron, terlisulfuron, terlisulfuron, terlisulfuron, terlisulfuron, terlisulfuron, terlisulfuron Flupyrazosulfuron, methyl methacrylate, tetrazolium methoxysulfuron, flupyrazosulfuron, chlorpyrifos, bromochlor, dimethoate, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, pyrazosulfuron, bentazon, pyrazosulfuron, oxadiazon, pyrazosulfuron, isoxadiazon, cyclohexane, isopropyl methoxysulfuron, propyl methoxysulfuron, indicarb, sodium chlorate, cogongrass Trichloroacetic acid, monochloroacetic acid, hexachloroacetone, tetrafluoropropionic acid, forage fastener, bromophenol oxime, triazole sulfonate, methomyl, furazolidone, furazolidone, ethoxysulfuron, pyrimethanil, chlorphthalic acid, flurfluthrin, barnyardgrass, acrolein, bensulfuron-methyl, metribuzin, oat ester, thiamethoxam, styracil, hydroxyzine, methoxybenzone, pyrimethanil, chlorpyrifos, trichloropropionic acid, Alora c. Diethamquat, Etnipromid, Iprymidam, Ipfencarbazone, Thiencarbazone-methyl, Pyrimisulfan, Chlorflurazole, Tripropindan, Sulglycapin, methylsulfuron, Cambendichlor, Cyproterinic acid, Thiamethoxam, Etnipromidone, Etnipromidone, Etnipromidone-methyl ...LS 82-556, KPP-300, NC-324, NC-330, KH-218, DPX-N8189, SC-0744, DOWCO535, D K-8910, V-53482, PP-600, MBH-001, KIH-9201, ET-751, KIH-6127 and KIH-2023. ,

[0081] When used, commercially available formulations are diluted in a common manner if necessary, such as with water for wettable powders, concentrated emulsions, suspensions, and granules suspended in water. Powders, granules for soil application, or solutions for broadcasting and spraying generally do not require further dilution with an inert substance before use. The required dosage of Formula I compound varies with external conditions, such as temperature, humidity, and the nature of the herbicide used. It can vary considerably, for example, from 0.001 to 1.0 kg ai / ha, or more active ingredient, but is preferably between 0.005 and 750 g ai / ha, particularly between 0.005 and 250 g ai / ha. Detailed Implementation

[0082] The following examples are for illustrative purposes only and should not be construed as limiting the invention in any way. The scope of protection of this invention is defined by the claims. Given the economy and diversity of the compounds, we have preferably synthesized several compounds, some of which are listed in Table 1 below. Specific compound structures and corresponding compound information are shown in Tables 1-2. The compounds in Table 1 are only for better illustration of the invention and do not limit it. Those skilled in the art should not interpret this as limiting the scope of the invention to the following compounds.

[0083] Table 1. Compound Structures

[0084] Table 2 Compounds 1 H NMR

[0085] Several methods for preparing the compounds of the present invention are described in detail in the following schemes and examples. The raw materials can be commercially available or prepared by methods known in the literature or as detailed in the description. Those skilled in the art will understand that other synthetic routes can also be used to synthesize the compounds of the present invention. Although specific raw materials and conditions in the synthetic routes have been described below, they can be easily replaced with other similar raw materials and conditions. Such variations or modifications to the preparation methods of the present invention, such as various isomers of the compounds, are all included within the scope of the present invention. Furthermore, the preparation methods described below can be further modified according to the disclosure of the present invention using conventional chemical methods well known to those skilled in the art. For example, protecting appropriate groups during the reaction process, etc.

[0086] The following method examples are provided to further illustrate the preparation methods of the present invention. The specific substances, types, and conditions used are intended to further explain the invention and are not intended to limit its reasonable scope. The reagents used in the synthetic compounds shown below are either commercially available or can be easily prepared by those skilled in the art.

[0087] Examples of representative compounds are given below. The synthesis methods of other compounds are similar and will not be described in detail here.

[0088] 1. Synthesis of Compound 4

[0089] (1) Compound 4-1 (2.00 g, 1.00 eq) was dissolved in 8 mL of ACN, and 4-2 (2.50 g, 2.00 eq) and K2CO3 (3.34 g, 3.00 eq) were added. The system was heated to 50 °C and reacted overnight. The mixture was extracted with EA and H2O, the organic phase was collected, dried over anhydrous sodium sulfate, mixed, and purified under normal phase to give a brown solid compound 4-3 (1.60 g, yield 80%).

[0090] (2) Compound 4-3 (1.60 g, 1.00 eq) was dissolved in 8 mL of solvent with EtOH:H2O = 3:1, NH4Cl (0.56 g, 3.00 eq) was added, and Fe (0.85 g, 2.00 eq) was added while stirring. The system was heated to 80 °C and reacted for 2 h. After the reaction was complete, the mixture was filtered through diatomaceous earth, and the organic phase was dried and concentrated to obtain brown oily compound 4-4 (0.80 g, yield 50%).

[0091] (3) Dissolve compound 4-4 (0.80 g, 1.00 eq) in 5.0 mL of concentrated hydrochloric acid, cool to 0 °C in an ice bath, dissolve sodium nitrite (228 mg, 1.2 eq) in a small amount of water, pre-cool, and add dropwise to the reaction system. React at 0 °C for half an hour. Dissolve stannous chloride (1.04 g, 2 eq) in concentrated hydrochloric acid, pre-cool, and add to the reaction system. React at 0 °C for 2 hours. A precipitate is formed. Filter and collect the solid. The solid is the product, and a pale yellow solid crude compound 4-5 (0.70 g, crude product is used directly in the next step) is obtained.

[0092] (4) Dissolve compound 4-5 (0.70 g, 1.00 eq) in 5 mL of HCl:H2O = 1:1 solution, cool to 0 °C in an ice bath, add pyruvic acid (0.20 mL, 1.2 eq) dropwise to the system, react at room temperature for 2 h, a yellow solid precipitates out, filter, collect the solid, the solid is the product, and obtain crude product of pale yellow solid compound 4-6 (0.60 g).

[0093] (5) Compound 4-6 (0.60 g, 1.00 eq) was dissolved in 5 mL of toluene, and DPPA (440 mg, 1 eq) and TEA (0.45 mL, 3 eq) were added. The system was heated to 110 °C and reacted for 2 h. The organic phase was concentrated and purified to obtain a white solid product 4-7 (400 mg, yield 67%).

[0094] (6) Compound 4-7 (400 mg, 1 eq), sodium difluorochloroacetate (246 mg, 1.5 eq) and potassium carbonate (444 mg, 3 eq) were dissolved in 5 mL of DMF. The system was heated to 120 °C and reacted for 2 h. The mixture was extracted with EA and H2O, and the organic phase was collected. The organic phase was dried over anhydrous sodium sulfate and purified in the normal phase to obtain a white solid compound 4 (150 mg, yield 37%).

[0095] 2. Synthesis of Compound 86

[0096] (1) Compound 4-1 (2 g, 1.0 eq) was dissolved in 30 mL of DMF, and 2-bromomethyltetrahydrofuran (2.66 g, 2.0 eq) and potassium carbonate (3.34 g, 3.0 eq) were added. The mixture was reacted overnight at 50 °C. The reaction was monitored by LCMS until complete, and the product was the main peak. The mixture was filtered and concentrated under reduced pressure to obtain a dark brown oily substance 86-1, which was used directly in the next step of the reaction.

[0097] (2) Compound 86-1 was dissolved in a mixed solvent of 30 mL ethanol and 10 mL water, and iron powder (1.35 g, 3.0 eq) and ammonium chloride (1.29 g, 3 eq) were added. The mixture was reacted overnight at 80 °C. The reaction was monitored by LCMS until the starting material was completely reacted, and the product was the main peak. The mixture was filtered and evaporated to dryness, extracted three times with ethyl acetate and saturated brine, and concentrated. The residue was purified by column chromatography to give a brown solid 86-2 (1.1 g, yield 62%).

[0098] (3) Compound 86-2 (1.1 g, 1.0 eq) was dissolved in a solvent (15 mL concentrated hydrochloric acid, 5 mL water). Under ice bath conditions, an aqueous solution of sodium nitrite (0.27 g, 1.05 eq) was added. After maintaining the temperature for 30 min, a hydrochloric acid solution of stannous chloride (1.38 g, 2 eq) was added dropwise. After the addition was complete, the reaction was maintained at the temperature for 1 h. LCMS monitoring showed that the reaction of the starting material was complete, and the product was the main peak. The mixture was filtered and dried to obtain a grayish-white solid 86-3 (0.8 g, yield 62%).

[0099] (4) Compound 86-3 (0.8 g, 1 eq) was added to 10 mL of concentrated hydrochloric acid, and pyruvic acid (0.22 g, 1.1 eq) was added dropwise at 0 °C. The mixture was then allowed to warm naturally to room temperature. The reaction of the starting material was monitored by LCMS until it was complete, and the product was the main peak. The mixture was filtered and dried to obtain compound 86-4 (a grayish-white solid, 0.5 g, yield 57%).

[0100] (5) Compound 86-4 (0.5 g, 1 eq) was added to toluene (15 ml), followed by triethylamine (0.39 g, 3 eq) and DPPA (0.32 g, 1 eq). The mixture was heated to 110 °C under N2 protection and reacted overnight. The reaction was monitored by LCMS until the starting material was completely reacted, with the product as the main peak. The residue was purified by column chromatography to give a grayish-white solid 86-5 (0.3 g, 60% yield).

[0101] (6) Compound 86-5 (0.3 g, 1 eq) was added to 15 mL of DMF, along with potassium carbonate (0.32 g, 3 eq) and sodium difluorochloroacetate (0.36 g, 3 eq). The mixture was heated to 100 °C under N2 protection and reacted overnight. The reaction was monitored by LCMS until the starting material was completely reacted, with the product as the main peak. The residue was purified by column chromatography to obtain a grayish-white solid 86 (0.15 g, yield 44%).

[0102] 3. Synthesis of Compound 89

[0103] The preparation of compound 89-1 was performed according to compounds 4-7. Compounds 89-1 (500 mg, 1.34 mmol), 89-2 (713 mg, 2.67 mmol), and cesium fluoride (811 mg, 5.34 mmol) were dissolved in 20 mL of chloroform and reacted overnight at 30 °C with stirring. The reaction was monitored to ensure complete reaction. After drying and concentration, silica gel column chromatography was performed to give a pale yellow solid, compound 89 (237 mg, yield 39%).

[0104] 4. Synthesis of Compound 93

[0105] The preparation of compound 93-1 was performed according to compounds 4-7. Compound 93-1 (0.15 g, 0.42 mmol) was dissolved in chloroform, and compound 89-2 (0.22 g, 0.84 mmol) and CsF (0.13 g, 0.84 mmol) were added. The mixture was stirred overnight at room temperature. After the reaction was completed under controlled LCMS, the mixture was dried and purified in normal phase to give compound 93 (0.08 g, 0.2 mmol, yield 47%).

[0106] Bioactivity evaluation:

[0107] The activity level standards for plant damage (i.e., growth control rate) are as follows:

[0108] Level 9: Complete death;

[0109] Level 8: Growth control rate is greater than or equal to 90% and less than 100%;

[0110] Level 7: Growth control rate is greater than or equal to 80% and less than 90%;

[0111] Level 6: Growth control rate is greater than or equal to 70% and less than 80%;

[0112] Level 5: Growth control rate is greater than or equal to 50% and less than 70%;

[0113] Level 4: Growth control rate is greater than or equal to 30% and less than 50%;

[0114] Level 3: Growth control rate greater than or equal to 20% and less than 30%;

[0115] Level 2: Growth control rate greater than or equal to 10% and less than 20%;

[0116] Level 1: Growth control rate less than 10%;

[0117] Level 0: No effect.

[0118] The above growth control rates are fresh weight control rates.

[0119] Pre-seeding test:

[0120] Seeds of monocotyledonous and dicotyledonous weeds, as well as seeds of major crops, were placed in plastic basins filled with soil and covered with 0.5-2 cm of soil. The tested compounds of this invention were dissolved in acetone, then Tween 80 was added, and the solutions were diluted with water to a certain concentration. The solutions were sprayed immediately after sowing. The results were observed after approximately two weeks of cultivation in a greenhouse. Representative data are listed in Table 3.

[0121] Table 3. Pre-seeding test results (24 g a.i. / ha)

[0122] Note: N represents no data.

[0123] Post-emergence testing:

[0124] Seeds of monocotyledonous and dicotyledonous weeds, as well as seeds of major crops, were placed in plastic pots filled with soil and covered with 0.5-2 cm of soil. The plants were then allowed to grow in a suitable greenhouse environment. Approximately two weeks after sowing, at the 2-4 leaf stage, test plants were treated. The tested compound of this invention was dissolved in acetone, and then Tween 80 was added. Methyl oleate emulsifiable concentrate at a concentration of 900 L / ha was used as a synergist. The solution was diluted with water to a specific concentration and sprayed onto the plants using a spray tower. After approximately two weeks of cultivation in the greenhouse following application, the experimental effects on weeds were statistically analyzed. Representative data are listed in Table 4.

[0125] Table 4. Post-emergence test results (40.5 g ai / ha)

[0126] Table 5. Post-emergence test results of the control compound (40.5 g ai / ha)

[0127] Table 6. Pre-seeded test results of the control compound (6g ai / ha)

[0128] Table 7. Post-emergence test results of the control compound (4.5 g ai / ha)

[0129] Note: N represents no data; control compound A: Reference compound B: Reference compound C:

[0130] Furthermore, numerous tests have revealed that the compounds and compositions described in this invention can control many key grass weeds, broadleaf weeds, and sedges, demonstrating excellent commercial value.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A benzoxazinone compound represented by the general formula I: ###00001### or a salt thereof. wherein R1 and R2 represent halogens independently, or together they form -CH2CH2-. R3 represents cycloalkyl, heterocyclic, alkylthio, alkoxy, or alkoxyalkyl; R4, R5, R6, and R7 each independently represent hydrogen, halogen, alkyl, alkenyl, alkynyl, cyano, nitro, cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the alkyl, alkenyl, or alkynyl group is optionally substituted by at least one group selected from halogen, cyano, nitro, cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; R8 represents hydrogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, alkoxyalkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclic, heterocyclic alkyl, or -N(R)2; The aforementioned "cycloalkyl", "heterocyclic" or "aryl" may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, alkyl, alkenyl, ynyl, cycloalkyl, haloalkyl, haloalkenyl, haloynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R; R independently represents hydrogen, alkyl, alkenyl, alkynyl, alkyl, alkenyl or alkynyl, cycloalkyl, cycloalkenyl, aryl, cyano or alkoxycarbonyl, cycloalkyl, cycloalkenyl, phenyl, or cycloalkyl, cycloalkenyl or phenyl substituted by at least one group selected from halogen, cyano, nitro, alkyl, haloalkyl, alkoxycarbonyl, alkylthio, alkylsulfonyl, alkoxy or haloalkoxy.

2. The benzoxazinone compound or its salt according to claim 1, characterized in that, R3 represents C3-C8 cycloalkyl, heterocyclic, C1-C8 alkylthio, C1-C8 alkoxy, or C1-C8 alkoxy-C1-C8 alkyl; R4, R5, R6, and R7 independently represent hydrogen, halogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, cyano, nitro, C3-C8 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the C1-C8 alkyl, C2-C8 alkenyl, or C2-C8 alkynyl is optionally substituted by at least one group selected from halogen, cyano, nitro, C3-C8 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; R8 represents hydrogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, halo-C1-C8 alkyl, halo-C2-C8 alkenyl, halo-C2-C8 alkynyl, C1-C8 alkoxy-C1-C8 alkyl, C3-C8 cycloalkyl, C3-C8 cycloalkyl-C1-C8 alkyl, aryl, aryl-C1-C8 alkyl, heterocyclic, heterocyclic-C1-C8 alkyl, or -N(R)2; The aforementioned "C3-C8 cycloalkyl", "heterocyclic" or "aryl" may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 ynyl, C3-C8 cycloalkyl, halo-C1-C8 alkyl, halo-C2-C8 alkenyl, halo-C2-C8 ynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R; R independently represents hydrogen, C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, C1-C8 alkyl, C2-C8 alkenyl, C3-C8 cycloalkyl, C3-C8 cycloalkenyl, aryl, cyano, or C1-C8 alkoxycarbonyl, or C1-C8 alkyl, C2-C8 alkenyl, C3-C8 cycloalkyl, C3-C8 cycloalkenyl, phenyl, or C3-C8 cycloalkyl, C3-C8 cycloalkenyl, nitro, C1-C8 alkyl, halogenated C1-C8 alkyl, C1-C8 alkoxycarbonyl, C1-C8 alkenyl, C1-C8 alkylsulfonyl, C1-C8 alkoxy, or halogenated C1-C8 alkoxy, or C3-C8 cycloalkyl, C3-C8 cycloalkenyl, or phenyl.

3. The benzoxazinone compound or its salt according to claim 1, characterized in that, R3 represents C3-C6 cycloalkyl, heterocyclic, C1-C6 alkylthio, C1-C6 alkoxy, or C1-C6 alkoxy-C1-C6 alkyl; R4, R5, R6, and R7 independently represent hydrogen, halogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, cyano, nitro, C3-C6 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; wherein the C1-C6 alkyl, C2-C6 alkenyl, or C2-C6 alkynyl is optionally substituted by at least one group selected from halogen, cyano, nitro, C3-C6 cycloalkyl, aryl, heterocyclic, -OR, -SR, -SOR, -(SO2)R, -N(R)2, -O(CO)R, -O(CO)OR, -(CO)R, or -(CO)N(R)2; R8 represents hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, halo-C1-C6 alkyl, halo-C2-C6 alkenyl, halo-C2-C6 alkynyl, C1-C6 alkoxy-C1-C6 alkyl, C3-C6 cycloalkyl, C3-C6 cycloalkyl-C1-C6 alkyl, aryl, aryl-C1-C6 alkyl, heterocyclic, heterocyclic-C1-C6 alkyl, or -N(R)2; The aforementioned "C3-C6 cycloalkyl", "heterocyclic" or "aryl" may optionally be replaced by at least one group selected from oxo, halogen, cyano, nitro, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 ynyl, C3-C6 cycloalkyl, halo-C1-C6 alkyl, halo-C2-C6 alkenyl, halo-C2-C6 ynyl, -OR, -SR, -(CO)R, -(CO)OR, -(CO)N(R)2, -(CS)N(R)2, -(SO)R or -(SO2)R; R independently represents hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, C1-C6 alkyl, C2-C6 alkenyl, C3-C6 cycloalkyl, C3-C6 cycloalkenyl, aryl, cyano or C1-C6 alkoxycarbonyl, or C1-C6 alkyl, C2-C6 alkenyl, C3-C6 cycloalkyl, C3-C6 cycloalkenyl, phenyl, or C3-C6 cycloalkyl, C3-C6 cycloalkenyl, phenyl, or C3-C6 cycloalkyl, C3-C6 cycloalkenyl, nitro, C1-C6 alkyl, halogenated C1-C6 alkyl, C1-C6 alkoxycarbonyl, C1-C6 alkenyl, C1-C6 alkylsulfonyl, C1-C6 alkoxy or halogenated C1-C6 alkoxy, or C3-C6 cycloalkyl, C3-C6 cycloalkenyl or phenyl. Preferably, the compound is selected from any one of the compounds in Table 1 of the specification.

4. A method for preparing the benzoxazinone compound or its salt as described in any one of claims 1-3, comprising the following steps: (1) When R8 is hydrogen, the compound represented by general formula II is reacted with an azide reagent to give the compound represented by general formula I-1. The reaction equation is as follows: Preferably, the reaction (1) is carried out in the presence of a base and a solvent; more preferably, the base is selected from at least one of inorganic or organic bases; the azide reagent is selected from at least one of DPPA, diphenylphosphonic chloride and sodium azide, ethyl azide acetate or tributyltin azide; and / or the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, toluene or ethyl acetate; (2) When R8 is CHF2, the compound represented by general formula I-1 reacts with the compound represented by general formula III, and after decarboxylation, gives the compound represented by general formula I-2. The reaction equation is as follows: (3) When R8 is CHF2, the compound represented by general formula I-1 reacts with the compound represented by general formula V to give the compound represented by general formula I-2. The reaction equation is as follows: Preferably, reactions (2) and (3) are carried out in the presence of a base and a solvent; the base is selected from at least one of inorganic or organic bases; and / or the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, chloroform, toluene, or ethyl acetate. (4) When R8 is R8', the compound represented by general formula I-1 reacts with the compound represented by general formula IV to give the compound represented by general formula I-3. The reaction equation is as follows: Preferably, the reaction (4) is carried out in the presence of a base and a solvent; more preferably, the base is selected from at least one of inorganic bases or organic bases; and / or the solvent is selected from at least one of aromatic hydrocarbons (such as toluene, xylene), DMF, DMA, methanol, ethanol, acetonitrile, dichloroethane, DMSO, dioxane, dichloromethane, toluene or ethyl acetate; Wherein, Hal represents a halogen, W1 and W2 independently represent C1-C6 alkyl groups, and R8' represents a group in R8 other than hydrogen and CHF2; the definitions of R1, R2, R3, R4, R5, R6, R7 and R8 are as described in any one of claims 1-3.

5. An intermediate as described in Formula II of claim 4.

6. A herbicidal composition, characterized by comprising: The herbicide contains at least one of the benzoxazinone compounds or their salts as described in any one of claims 1-3; preferably, it further includes a formulation adjuvant; more preferably, it further includes other active ingredients.

7. A method for controlling weeds, comprising applying a herbicidal effective amount of at least one of the benzoxazinone compounds of any one of claims 1-3 or a salt thereof, or the herbicide composition of claim 6, to plants or weedy areas.

8. Use of the benzoxazinone compound or its salt as described in any one of claims 1-3 or the composition as described in claim 6 for weed control, preferably, the benzoxazinone compound or its salt is used to control weeds in a useful crop, said useful crop being a transgenic crop or a crop treated with genome editing technology.

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