78 results about "Nitroalkene" patented technology

Topical compositions comprising an effective amount of a nitroalkene and a carrier are used to prevent skin conditions or damage and to treat skin conditions and damage including rosacea, eczema, psoriasis, xerosis, dermatitis, seborrhea, thermal and radiation burns (including sunburn), acne, alopecia, skin aging, scars, and skin inflammation.

The invention provides a chiral pyrrolidine functionalized imidazolium salt, and a preparation method and an application thereof. The chiral pyrrolidine functionalized imidazolium salt is bromized 1-[2-(S)-(pyrrolidyl)methyl]-3-benzoyl methyl imidazole hydrobromide. The preparation method of the chiral pyrrolidine functionalized imidazolium salt comprises the following steps of: by taking natural amino acid L-proline as the starting raw material, obtaining the chiral pyrrolidine functionalized imidazolium salt through a plurality of conventional organic synthetic reactions such as Boc acylation, carboxylic acid reduction, hydroxyl sulfonylation, nucleophilic substitution of imidazole anions, quaternization of halohydrocarbon and de-Boc protection. The chiral pyrrolidine functionalized imidazolium salt provided by the invention is capable of catalyzing asymmetric Michael addition reaction of cyclohexanone and nitroolefin, and has extremely high diastereoselectivity and enantioselectivity.

The invention discloses a chiral 1,2-diamine compound and a preparation method and application thereof. The molecular structure general formula of the chiral 1,2-diamine compound is shown as the general formula (I) in the specification. The preparation method of the chiral 1,2-diamine compound comprises the steps that an amine compound A and a nitroolefin compound B are added to a reaction system containing an n-heterocyclic carbine catalyst, an alkali reagent, a proton additive and a dewatering reagent for reacting and other steps. The chiral 1,2-diamine compound comprises chiral quaternary carbon atoms containing electrondrawing groups and amino groups, and can be widely used for synthesizing drug intermediates, especially heterocyclic ring structure compounds, and preparing functional materials. The preparation method is simple in process and low in requirement for reaction conditions, the reaction process is safe and controllable, the atom utilization rate and production efficiency are high, meanwhile, the enantioselectivity of products is efficiently guaranteed, and the environment pollution pressure of the methodology is low through the introduction of the small organic molecule asymmetric catalysis concept.

The invention provides a preparation method of addition product of aldehyde and nitroolefin. (S)-proline lithium or (R)-proline lithium is used as a chiral catalyst to katalyze the asymmetric Michael addition reaction between aldehyde and nitroolefin. The (S)-proline lithium or (R)-proline lithium has high catalytic efficiency; and the obtained addition product of aldehyde and nitroolefin has the advantages of high stereoselectivity and simple structure, is cheap and accessible, and can easily implement large-scale production.

The invention relates to a chiral sulfoxide alkene ligand, a preparation method and an application thereof. According to the present invention, cheap and available 2-bromobenzyl bromide is adopted as a start material to obtain 2-bromobenzyl diethyl phosphate; then a Horner-Emmons reaction is adopted to introduce an alkene group; and finally lithiation modification is performed on bromine, and a corresponding chiral sulfoxide group is introduced. With the present invention, the target product is conveniently and rapidly synthesized through three steps; coordinate of the novel chiral sulfoxide alkene ligand and rhodium can be well used for catalysis of conjugate addition reactions on cyclic ketene, nitroalkene, and cyano alkene by aryl boronic acid, especially for an addition reaction on cyclic ketene by aryl boronic acid, wherein a good catalysis effect of the addition reaction on the cyclic ketene by the aryl boronic acid is provided.

The invention discloses a method for the effective synthesis of optically active oxazoline-2-ketone derivative. The optically active oxazoline-2-ketone derivative has a structure represented by the formula (I), wherein, R is phenyl, para-methoxyphenyl, para-chlorophenyl, para-fluorophenyl, ortho-chlorophenyl, ortho-methoxyphenyl, meta-bromophenyl, 1-naphthyl, para-bromophenyl, para-nitrophenyl, para-methylphenyl or 3,4-difluorophenyl; R is phenyl, para-methylphenyl, para-methoxyphenyl, para-fluorophenyl, para-chlorophenyl, para-bromophenyl or 2-furyl. Such compounds can be obtained by means of high diastereoselectivity and high enantioselectivity of tandem reaction of organically catalytic C2 symmetrical chiral sulfur ylide and nitroolefin.

The invention discloses a tetrahydroindole compound, and a preparation method and an application thereof, and belongs to the technical field of the chemical synthesis. Raw materials comprising a 1,3-cyclohexanedione compound, nitroalkene and amine undergo a one-pot process under microwave radiation in water as a solvent under the action of L-proline as a catalyst to prepare the tetrahydroindole compound in high yield. The catalyst used in the invention is a non-transition metal catalyst having a low price, so the synthesis cost is substantially reduced; the reaction condition in a catalysis system is mild and can be easily controlled, and the product can be obtained through a domino cyclized multi-component one-step reaction; and the method has the advantages of green and pollution-free experiment program, simple and effective experiment operation, and diversified product structure. The method which uses water as a solvent has the characteristics of simple post-treatment, small pollution to the environment, no damages to the health of the body of an operation worker, and easy realization of the industrialized production.

The invention provides a method for synthesizing a beta-iodo-nitroolefin compound as shown in a formula (III). The method comprises: mixing substituted alkyne shown in a formula (I), an iodine source and tert-butyl nitrite shown in a formula (II) in a solvent for completely reacting to obtain reaction liquid, and after reacting for 4 to 6h at a temperature of 25 to 80 DEG C, processing the reaction liquid to obtain the beta-iodo-nitroolefin compound, wherein the solvent is tetrahydrofuran, acetonitrile, acetone or 1,2-dichloroethane, and a ratio of quantities of fed substances, i.e., the substituted alkyne shown in the formula (I), the iodine source and the tert-butyl nitrite shown in the formula (II), is 1 to (0.5 to 1) to (2 to 5). The method provided by the invention is high in substrate adaptability and mild in reaction condition, does not relate to use of an oxidizing agent and a metal catalyst, is safe and environmental-friendly, is simple in reaction operation, and is more beneficial to application in medicine synthesis. The formulas are shown in the description.

The invention belongs to the technical field of catalytic organic synthesis and particularly relates to a method for catalyzing an asymmetric Michael addition reaction and a catalyst. Nitroolefin and1,3-dicarbonyl ketone are taken as raw materials, a calix[4]squaramide-diaminocyclohexane derivative is taken as a catalyst, dichloromethane is taken as a solvent, the Michael addition catalytic reaction is conducted, after the reaction is completed, the solvent is concentrated, and a product is obtained through silica gel column chromatographic separation. The calix[4]squaramide-diaminocyclohexane catalyst is mild in synthetic process condition and high in catalytic efficiency, the good ee value can be obtained through the catalytic reaction under the room temperature condition, and wide application prospects are realized.

The invention belongs to the technical field of organic synthesis, aims at solving the problems that an existing synthesis method of oseltamivir is multiple in reaction steps, low in overall yield and high in cost. The invention provides a synthesis method of oseltamivir. The method comprises the following steps of (1) adopting 3-pentyloxy acetaldehyde and nitroolefin as substrates and reacting under catalysis of a catalyst in the presence of lewis acid to obtain an aldehyde intermediate A; (2) reacting the obtained aldehyde intermediate A with 2-diethoxy oxygen-phosphorus acrylic acid ethyl ester under the action of an alkali catalyst to obtain a cyclohexenyl intermediate B; (3) reacting the cyclohexenyl intermediate B with thiocresol to obtain a cyclohexane intermediate C; (4) preparing a compound D from the cyclohexane intermediate C under the action of zinc powder and trimethylchlorosilane; and (5) obtaining a final product oseltamivir from the intermediate D obtained in the step (4) under the action of an ammonia gas and potassium carbonate. The method has the characteristics that the route is short and the catalyst is easy to recover.

The invention discloses a preparation method of 1, 3-dimethyl-pentylaminehydrochloride. The preparation method comprises the following steps: performing condensation and dehydration on 2-methylbutyraldehyde used a starting material and nitroethane under the catalyzing of an acetic acid/ ethylenediamine composite catalyst in a methylbenzene solvent to obtain a nitroolefin compound; reducing through potassium borohydride or sodium borohydride; then reducing through palladium carbon and acidizing through hydrochloric acid to obtain 1, 3-dimethyl-pentylaminehydrochloride. The preparation method of 1, 3-dimethyl-pentylaminehydrochloride has the advantages that the raw materials are simple and easy to obtain; the reaction condition is mild; the total yield is high; the industrial production can be performed well.

The invention relates to a preparation method of beta-trans-nitroolefin. The method comprises: sequentially adding an olefin compound, a nitration reagent and a solvent into a reaction container, mixing the substances uniformly, and carrying out constant temperature reaction for 18h under an illumination condition to obtain a reaction solution; and sequentially carrying out drying, concentration and column chromatography treatment on the reaction solution to obtain the beta-trans-nitroolefin compound. The method is simple and practicable, low in cost and high in product yield, can realize large-scale production, and has good industrial application prospects in the aspects of functional organic material, bioactive compound and drug synthesis.

The invention discloses a synthesizing method for a 3-aroyl indole compound as shown in the following formula (C). The synthesizing method is characterized in that R1 replacing indole (A) and R2 replacing nitroalkene serve as raw materials, cerium salt serves as a catalyst, and in an air environment, acylation reaction is performed. According to the synthesizing method for the 3-aroyl indole compound, the more stable and cheaper cerium salt is adopted to serve as the catalyst, absolute non-water processing does not need to be performed in the reaction, inert gases are not needed for protection, that is, the acylation reaction can be directly performed, the reaction condition is milder, and the yield is high.

The invention discloses a method for synthesizing NH-1,2,3-triazole shown by a formula (I). Under the catalytic action of a Lewis acid catalyst, nitroalkene shown by a formula (II) and hydrazoic acid salt undergo 1,3-dipolar cycloaddition, wherein Ar is phenyl, substituted phenyl, naphthyl, furyl, thienyl, indolyl or styryl; and R is hydrogen atom, phenyl, substituted phenyl or C1-C6 alkyl. The method is mild in reaction condition, low in production cost, wide in substrate application range and high in yield, and provides a new path for synthesizing NH-1,2,3-triazole compounds with medicinal activity.

The invention provides a preparation method of an indolocarbazole compound, and the indolocarbazole compound is prepared through steps of: with substituted indole and nitroolefin as initial raw materials, performing a multi-component reaction under a room-temperature acidic condition. The preparation method provided by the invention has the advantages of mild reaction conditions, simple operation,no need of a metal catalyst, easily available reaction raw materials, simultaneous introduction of a plurality of substituents, easy separation of products and the like, and has a wide substrate application range. According to the method, various substrate structures can tolerate the reaction conditions, the application range is wide, and a simple and feasible method is provided for synthesizingthe indolocarbazole compound. The structural formula of the indolocarbazole compound is shown in the specification.

The invention discloses a chiral dicyclic compound and an asymmetric syntheses method thereof, and the chiral dicyclic compound has a structure as shown in formula (I). According to the invention, a cyclohexenone derivative with a structure as shown in formula (II) and a nitroalkene derivative with a structure as shown in formula (III) are used as substrates, and a reaction is performed in an organic solvent with the catalysis of a chiral secondary amine catalyst, a polyglycol-series compound and an acid so as to obtain the chiral dicyclic compound with a structure as shown in formula (I). The chiral dicyclic compound synthesized in the invention has chirality, can be used as a synthetic intermediate of chiral compounds, and has wide application prospects.

The present invention relates to the preparation of highly efficient chiral heterogeneous catalyst for asymmetric nitroaldol reaction, wherein Henry reactions of various aldehydes such as aromatic, aliphatic, α,β-unsaturated aldehydes, alicyclic aldehydes and nitroalkenes were carried out to produce optically active β-nitroalcohols in high yield, with moderate to excellent enantioselectivity (ee up to >99%) in presence of a base and an optically active chiral heterogeneous catalyst.

The invention relates to a method for selectively synthesizing an allylic sulfone compound. The method comprises the following steps: under the conditions of taking nitroolefin and sodium sulfinate stable and convenient to operate as raw materials and having participation of a non-metal catalyst and an oxidant, adding a solvent for heating and stirring, and processing to obtain the allylic sulfone compound. The method has the beneficial effects that by adopting low-cost and easily available I2 or TBAI as a catalyst, nitroolefin is activated by iodine, and sulfonate can be used as a mild lewis base in reaction. The key step of the reaction is that lewis base can promote the balance of nitroolefin and ally-nitro compound, and through the step, stable nitroolefin is converted into ally-nitro compound, and due to the compounding of ally-nitro, free radical addition reaction can occur easily, so that the reaction is more easily conducted under mild conditions, the reaction rate is increased, the reaction time is shortened, and the compound of allylic sulfone compound structure can be more conveniently and effectively synthesized.

The invention discloses a chiral gamma, gamma-disubstituted butenolide compound and a preparation method thereof. Chiral gamma, gamma-disubstituted butenolide compounds widely exist in various naturalproducts, have important biological activity, and are also important intermediates for constructing polyterpene compounds and medicines. According to the application, a series of chiral gamma, gamma-disubstituted butenolide compounds with the yield as high as 98% and the stereoselectivity greater than 20: 1dr and 99% ee are synthesized through a vinylogous Michael addition reaction of gamma-dimerfuranone catalyzed by a bifunctional thiourea catalyst and alpha, beta-unsaturated nitroolefin. According to the method, the functional gamma, gamma-disubstituted butenolide compound with multiple chiral centers can be conveniently, quickly and efficiently obtained.

An optically active nitro compound having two hydrogen atoms on its α-cabon atom and having β-asymmetric carbon atom can be produced by making α, β-unsaturated nitroolefin having a hydrogen atom on its α-cabon atom react with at least two organosilicon compounds having at lest one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex, or react with an organosilicon compound having at least one silicon-hydrogen bond in the molecule in the presence of an asymmetric copper complex and water.

The invention relates to a preparation method of a compound, more specifically to a preparation method of an important intermediate (S)-2-isopropyl-4-oxobutyric acid methyl ester for synthesis of aliskiren. The preparation method provided by the invention comprises the following steps of: using isobutyraldehyde and nitromethane as raw materials, performing a Henry reaction and an elimination reaction to obtain corresponding conjugated nitroolefin, performing a Michael addition reaction between conjugated nitroolefin and acetaldehyde in the presence of a chiral catalyst to obtain (S)-4-methyl-3-(nitro methyl)pentanal, oxidizing the intermediate to obtain (S)-2-isopropyl-4-oxobutanoic acid, followed by methyl esterification to obtain (S)-2-isopropyl-4-oxobutyric acid methyl ester. The preparation method provided by the invention requires no low temperature, metal organic reagents or chiral separation, has advantages of easily obtained and low-priced raw materials and reagents, few synthesis steps, mild reaction condition and high yield, and is more suitable for industrial production.