38results about "Organic free radical generation" patented technology

The invention relates to a novel method based on a nitration/cyclization reaction of a 1,6-eneyne compound. According to the method, the 1,6-eneyne compound and copper nitrate are used as raw materials and subjected to the nitration/cyclization reaction in a solvent under the action of an oxidizing agent until the raw materials are completely reacted, and then post-treatment is performed to obtaina nitro-substituted 2-pyrrolidone compound; in the process of the nitration reaction, participation of water in the solvent is not needed, and an intermediate with strong acidity such as nitrous acidis not produced, so reaction process is greatly simplified and is carried out under a neutral condition, the nitration reaction process has wide hydrogen sources, and high-regioselectivity and high-yield preparation of the nitro-substituted product is realized in a mild oxidation system. The method has the advantages of simple and convenient operation, usage of cheap and easily available raw materials, low cost, a wide application range of reaction substrates, mild reaction conditions, high efficiency and stability, is particularly suitable for industrial production, presents good applicationprospects, and provides a new thought for free radical nitration reactions.

The invention discloses a green synthesis method of amino alcohol compounds under visible light catalysis, and belongs to the technical field of organic synthesis. The green synthesis method specifically comprises the following steps that S1, 90.4mg of N-phenylglycine, 1.9mg of a photocatalyst, 2ml of water and 20.4ul of benzaldehyde are added in sequence into 10ml of a dried Schlenk tube; S2, three times of air extraction operation is conducted on a reaction bottle to ensure that no water or oxygen exists in a reaction tube before sealing; S3, the reaction bottle is placed under Blue LED irradiation, mixing is conducted until TLC detecting reaction is finished; and S4, 5 ml of ethyl acetate is correspondingly extracted for 4 times, organic phases are collected, anhydrous Na2SO4 is used for drying, appropriate silica gel is added and concentrated under decompression, and obtained residues are purified through column chromatography to obtain the product amino alcohol compounds. Comparedwith the prior art, the green synthesis method has the characteristics of simple synthesis route, easy and convenient operation, little environmental pollution, mild reaction conditions, good controllability of reaction conditions, and wide application range of substrates.

The invention discloses a synthesis method of a beta-hydroxyl substituted sulfonyl compound. The synthesis method of the beta-hydroxyl substituted sulfonyl compound comprises the following steps: catalyzing reaction of phenylhydrazine and DABCO.(SO2)2 in the air by copper salt in an organic solvent and at room temperature to generate sulfonylfree radical so as to perform free radical addition on olefin; and then combining with oxygen molecules in the air to form a peroxide intermediate and performing catalytic reduction to prepare the beta-hydroxyl substituted sulfonyl compound. According to the method, the beta-hydroxyl substituted sulfonyl compound is constructed at one step by utilizing an olefin bifunctionalization strategy under very mild condition, and the functional group diversityof the sulfonyl compound is enriched; the reaction raw materials are simple and easily available; and the method is low in cost, simple to operate and suitable for large-scale preparation, and has good application prospect.

The invention discloses a spiro bis(dihydrobenzosilole) phosphoric acid compound as well as a synthesis method and application of the spiro bis(dihydrobenzosilole) phosphoric acid compound. The invention provides a method for efficiently constructing a spiro bis(dihydrobenzosilole) phosphoric acid compound as shown in a formula I by using a spiro bis(dihydrobenzosilole) diphenol compound. The method has the characteristics of simplicity and convenience in operation, easiness in obtaining raw materials, mild reaction conditions, high yield, convenience in purification and the like. The spiro bis(dihydrobenzosilole) phosphoric acid compound as shown in the formula I provided by the invention can be directly used as a chiral organic catalyst, or can be used for generating metal complexes with metal salts from the third group to the thirteenth group or can be mixed in situ for use, and is used for catalyzing an asymmetric organic synthesis reaction.

An object of a first aspect of the present invention is to provide a radical generating catalyst that can generate (produce) radicals under mild conditions. In order to achieve the above object, a first radical generating catalyst according to the first aspect of the present invention is characterized in that it includes ammonium and/or a salt thereof. A second radical generating catalyst according to the first aspect of the present invention is characterized in that it includes an organic compound having Lewis acidic properties and/or Brønsted acidic properties.

The invention discloses a method for preparing an aryl ketone derivative based on a free radical-free radical cross-coupling reaction such as ketonic acid decarboxylation and fatty aldehyde de-carbonylation. The method comprises the following steps: reacting aryl-substituted ketonic acid with fatty aldehyde under the catalytic action of ferric triacetylacetonate to generate an aryl ketone derivative; the gram-grade reaction can be realized by the method only by using 3mol% of an iron catalyst; and the method has the advantages of no need of consumption of a large amount of a Lewis acid catalyst or a stoichiometric organic metal reagent, mild reaction conditions, one-step reaction, few by-products, wide substrate application range and scalable reaction, and overcomes the defects of large catalyst consumption, insufficient functional group tolerance, many by-products and the like in the prior art.

The invention discloses a (Z)-4-trifluoromethyl-5-thio-alkyl-4-pentenone derivative and a preparation method therefor. The method comprises the steps of adding and mixing alkyne thioether with a structure represented by a formula II, S-(trifluoromethyl)dibenzothiophene onium trifluoromethyl sulfonate with a structure represented by a formula III, ruthenium tri(2,2-bipyridyl)dichloride, alkali anda solvent, forming a reaction system under blue-light irradiation, and carrying out aftertreatment after a reaction is completed, thereby obtaining the (Z)-4-trifluoromethyl-5-thio-alkyl-4-pentenone derivative with a structure represented by a formula I. According to the method, the stereoselective synthesis of the (Z)-4-trifluoromethyl-5-thio-alkyl-4-pentenone derivative is achieved in one step.The reaction conditions are mild, the substrate applicable range is broad, the reaction yield is good, the operation is simple, and a new way is provided for synthesis of trifluoromethyl containing pentenone compounds.

The present invention provides a solid-phase support for oligonucleotide synthesis for synthesizing long chain oligonucleotide, RNA oligonucleotide and modified oligonucleotide at high synthetic quantity and high purity with a low loading amount of a linker. Provided is a solid-phase support for oligonucleotide synthesis comprising a porous resin bead having a monovinyl monomer unit, a crosslinkable vinyl monomer unit and a polyethylene glycol unit and a cleavable linker loaded on its surface, the porous resin bead having a group capable of binding to a carboxy group by a dehydration condensation reaction on its surface, the cleavable linker having a carboxy group, wherein the carboxy group of the cleavable linker is bound to the group capable of binding to a carboxy group, by a dehydration condensation reaction, and a loading amount of the cleavable linker is 1 to 80 μmol/g relative to the weight of the porous resin bead.

The invention discloses a preparation method of a 2-(2, 2, 6, 6-tetramethyl piperidine nitroxide radical-4-subunit) acetic acid derivative and an application thereof. According to the 2-(2, 2, 6, 6-tetramethylpiperidine nitroxide radical-4-subunit) acetic acid derivative, commercialized 2, 2, 6, 6-tetramethyl-4-piperidone is subjected to simple oxidation to obtain 4-carbonyl-2, 2, 6, 6-tetramethylpiperidine nitroxide radicals, then the 4-carbonyl-2, 2, 6, 6-tetramethylpiperidine nitroxide radicals react with corresponding phosphorylation reagents, hydrolysis is carried out, the raw materials used in the method are cheap and easy to obtain, compared with the 2, 2, 6, 6-tetramethylpiperidine nitroxide radicals in the production process, the production efficiency is high, and the production cost is low, the compound is stable in property, basically free of any smell, convenient to store and capable of being stored at the room temperature, meanwhile, the preparation method is simple and easy to obtain, and when the compound is used as a catalyst, due to the fact that the compound is high in activity, large in solubility in a water phase and extremely small in catalyst dosage.

The invention discloses a preparation method of a free radical initiator, the preparation method comprises the following steps: feeding a hydroxylamine raw material, inorganic base and water according to a ratio, and carrying out acid-base neutralization reaction at 0-25 DEG C to dissociate hydroxylamine; adding tetrachlorophthalic anhydride, stirring at room temperature to react for 0.5-2 hours, reacting at 60-95 DEG C for 4-12 hours, washing with water, and drying at 60-80 DEG C for 10-24 hours to obtain an N-hydroxyl tetrachlorophthalimide crude product; and recrystallizing the N-hydroxyl tetrachlorophthalimide crude product in a mixed solvent of toluene and ethanol, filtering, and drying at 60-80 DEG C to obtain the N-hydroxyl tetrachlorophthalimide free radical initiator. According to the method, the adopted raw materials are simple, the conditions are easy to control, the preparation technology is green and environmentally friendly, the preparation repeatability is good, the free radical initiator is used in the oxidation reaction, a high-purity and high-yield product can be obtained, and the product obtained after repeated use still has high separation yield and purity.

The invention relates to a visible light-promoted synthesis method of dithiocarbamate compounds. The method uses substituted halogenated aromatic hydrocarbon, carbon disulfide and secondary amine as raw materials to construct the dithiocarbamate compounds through a one-pot method under the irradiation of a 23-watt fluorescent lamp. The preparation method has simple process and device, can completethe reaction in one step, and has the advantages of fewer reaction steps, low cost, high yield, good functional group compatibility and the like.

The invention relates to a free radical protective agent for preparing hexanedioic acid through direct oxidation of cyclohexane, and mainly solves the problem in the prior art that a free radical catalyst inactivates and decomposes easily in the reaction of preparing the hexanedioic acid through the direct oxidation of the cyclohexane. The free radical protective agent comprises citric acid and/orat least one of substituted phenol shown in the formula in the description, wherein the technical scheme that X and Y are independently selected from H or tertiary butyl, and X and Y are not used inH at the same time better solves the problem, and the free radical protective agent for preparing the hexanedioic acid through the direct oxidation of the cyclohexane can be applied to the industrialproduction of preparing the hexanedioic acid through the direct oxidation of the cyclohexane.