422results about "Preparation by cyanide reaction" patented technology

One aspect of the present invention relates to copper-catalyzed carbon-heteroatom and carbon-carbon bond-forming methods. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-sulfur bond between the sulfur atom of a thiol moiety and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In other embodiments, the present invention relates to copper(II)-catalyzed methods of forming a carbon-nitrogen bond between the nitrogen atom of an amide and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-carbon bond between the carbon atom of cyanide ion and the activated carbon of an aryl, heteroaryl, or vinyl halide or sulfonate. In another embodiment, the present invention relates to a copper-catalyzed method of transforming an aryl, heteroaryl, or vinyl chloride or bromide into the corresponding aryl, heteroaryl, or vinyl iodide. Yet another embodient of the present invention relates to a tandem method, which may be practiced in a single reaction vessel, wherein the first step of the method involves the copper-catalyzed formation of an aryl, heteroaryl, or vinyl iodide from the corresponding aryl, heteroaryl, or vinyl chloride or bromide; and the second step of the method involves the copper-catalyzed formation of an aryl, heteroaryl, or vinyl nitrile, amide or sulfide from the aryl, heteroaryl, or vinyl iodide formed in the first step.

Stereoselective and regioselective synthesis of compounds via nucleophilic ring opening reactions of aziridinium ions for use in stereoselective and regioselective synthesis of therapeutic and diagnostic compounds.

The invention provides a synthetic system of 3-cyanomethylbenzoic acid methyl ester and a method thereof. The system comprises an acylation reaction vessel used for preparation of m-Toluoyl chloride;a liquid chlorine feeding unit used for storing and conveying liquid chlorine; a chlorination reaction unit which is connected with the acylation reaction vessel and used as a chlorination reaction chamber of m-Toluoyl chloride; a micro-interface generator which is respectively connected with the liquid chlorine feeding unit and the chlorination reaction unit and used for receiving liquid chlorineconveyed by the liquid chlorine feeding unit, crushing the liquid chlorine into micro-droplets with the diameter being micron level and conveying the micro-droplets to the chlorination reaction unitafter the crushing; and an esterification and cyanation reaction unit which is connected with the chlorination reaction unit. In the prior art, m-Toluoyl chloride and liquid chlorine cannot be fully mixed when m-Toluoyl chloride and liquid chlorine react such that yield of 3-cyanomethylbenzoic acid methyl ester is reduced. The above problem is solved by the synthetic system and the method of the invention.

The present invention is a method for preparing triterpenoids such as 2-cyano-3,12-dioxoolean-1,9-dien-28-methyl ester and derivatives thereof from oleanic acid, ursolic acid, betulinic acid, sumaresinolic acid or hederagenin.

The invention relates to a synthesis method of a fine chemical product 2-(4-methylphenyl)propionic acid. According to the method, para-xylene is adopted as a raw material, and a chlorination reaction is carried out, such that a compound I which is p-methylbenzyl chloride is obtained; p-methylbenzyl chloride is subjected to a nitrilation reaction, such that a compound II which is p-methylbenzyl cyanide is adopted; p-methylbenzyl cyanide is subjected to methylation, such that a compound III which is 2-(4-methylphenyl)propionitrile is obtained; and 2-(4-methylphenyl)propionitrile is subjected to hydrolysis acidification, such that a compound IV which is 2-(4-methylphenyl)propionic acid is obtained. The method provided by the invention has the advantages of short process route, low three-waste discharge, low environment pollution, no solid waste production during reaction processes, relatively low production cost, less chemical substances used during reaction processes, less raw material types, easy-to-obtain raw materials, simple operation, high yield, relatively mild process conditions, and the like.

The invention relates to a synthetic method of an aryl cyanide in a water solution, which comprises the following steps: adding an aryl compound, a ferrocyanide and a phase transfer agent into an alkaline water solution, or adding the aryl compound and the ferrocyanide into a mixed solution of alkaline water and an organic solution; controlling the reaction temperature at 30 DEG C-140 DEG C; and synthesizing the aryl cyanide by catalytic coupling of a metal palladium catalyst. In the invention, the non-toxic environment-friendly ferrocyanide is used as a cyanide source for synthesizing the aryl cyanide, and water is used as an environment-friendly solvent to substitute the virulent cyanide and the organic solvent in the prior art, thereby solving the problem of environment pollution in the process of synthesizing the aryl cyanide. In the invention, good solubility of the ferrocyanide in the water and the strong polarity of the ferrocyanide are used, thereby greatly promoting the generation of the aryl cyaniding reaction, the cyaniding reaction can be finished at lower temperature (30 DEG C-140 DEG C), the reaction yield is high, and the application range of the aryl cyaniding reaction is improved.

A method for preparing organic products from aqueous solutions, such as waste or byproduct liquid streams and waste or byproduct gas or vapor streams, uses phase transfer catalysis to transfer a chemical species in low concentration from the aqueous solution to the organic phase or the aqueous-organic interface. The system has little or no organic solvent, and the organic phase contains an electrophile which participates in the reaction. In one embodiment, the aqueous solution is contacted with the electrophile and a phase transfer catalyst and, optionally, a pH adjusting agent in the event that the chemical species in the aqueous solution is not sufficiently ionized to react with the electrophile, and optionally an organic solvent. A method for continuously converting a chemical species involves this contacting step, separating the phases, then dividing the organic phase into the product, the phase transfer catalyst, and the optional organic solvent.

The invention discloses a functionalized column aromatic hydrocarbon derivative and a preparation method thereof. The functionalized column aromatic hydrocarbon derivative comprises an X unit, a Y unit and a Z unit, wherein the X unit is shown in a formula (I), the Y unit is shown in a formula (II), the Z unit is shown in a formula (III), and the six-membered rings of the X unit, the Y unit and the Z unit all have two para-position substituents and four unsubstituted positions; the formulas are as shown in the specification, each unit is connected through CH2 groups to form a ring-shaped structure, and each unit is connected with the other two adjacent units in a para-position manner at an unsubstituted position; and the formed ring-shaped structure is the functionalized column aromatic hydrocarbon derivative. Cyano groups, carboxyl groups and oxime are directly connected to the benzene ring monomer of the column aromatic hydrocarbon, so that the method for functionalizing the column aromatic hydrocarbon is expanded; and the connected groups can effectively change the electronic environment of the column aromatic hydrocarbon rings, so that the functionalized column aromatic hydrocarbon derivative has wide application in the fields of supramolecular host-guest identification and the like.

The present invention relates to a process for synthesizing ethyl-2,3-dicyano-propionate which is used for produce pesticide intermediate. The basic method of said process includes the following steps: using the raw materials of ethyl cyanoacetate, paraformaldehyde and sodium cyanide to synthesize ethyl-2,3-dicyano-propionate in the medium dimethyl sulfoxide; after the ethyl-2,3-dicyano-propionate is synthesized, using solvent dichloromethane to extract the synthesized ethyl-2,3-dicyano-propionate from medium dimethyl sulfoxide, reduced pressure desolventizing to obtain crude product, then rectifying said crude product so as to obtain the refined product ethyl-2,3-cyano-propionate. Said invention also provides the concrete requirements of the above-mentioned every step. The purity of the obtained product is greater than 98%.

A substituted aromatic compound substituted with Q is obtained by reacting a phosphazenium compound represented by formula (1)(in the formula, Q- represents an anion in a form derived by elimination of a proton from an inorganic acid, or an active hydrogen compound having an active hydrogen on an oxygen atom, a nitrogen atom or a sulfur atom; a, b, c and d, each independently, is 0 or 1, but all of them are not 0 simultaneously; and R groups represent the same or different hydrocarbon groups having 1 to 10 carbon atoms, or two Rs on each common nitrogen atom may be bonded together to form a ring structure) with a halogenated aromatic compound having halogen atoms; whereby, at least one halogen atom in the halogenated aromatic compound is substituted with Q (where, Q represents an inorganic group or an organic group in a form derived by elimination of one electron from Q- in formula (1)).

The present invention discloses improved process of preparing 4-amino-2-trifluoromethyl benzoitrile. The present invention prepares 4-amino-2-trifluoromethyl benzoitrile with trifluoro methyl fluorobenzene as main material and through three steps of positioning bromination, cyano group replacement and aminolysis substitution. The preparation process uses marketable glacial acetic acid, concentrated sulfuric acid, dibromo hydantoin, cuprous cyanide, liquid ammonia and alcohol, and has less consumption of strong acid and cuprous cyanide. The preparation process has facile materials, simple operation, short path, product purity over 99 % and total product yield up to 73-75 %, less exhaust of harmful matter, and low production cost.

The invention discloses a microporous polymer-nano-metal particle catalyst and especially relates to a microporous polymer-nano-palladium catalyst and a preparation method thereof. The preparation method comprises that prepared bromine-substituted triarylimidazole group-containing monomer 2, 4, 5-tris(4-bromophenyl)-1-alkylimidazole (TAI) undergoes a reaction to produce a microporous polymer, the microporous polymer is dissolved in DMF, and an appropriate amount of a H2PdCl4 aqueous solution is added into the DMF solution and undergoes a reaction, and excess NaBH4 is added into the reaction product so that the microporous polymer-nano-metal particle catalyst is obtained. The microporous polymer has high nitrogen content, has a multi-pore structure and helps to increase the loading amount of the transition metal. The catalyst has strong catalytic activity, good selectivity, mild reaction conditions, good reusability and a good market application value.

The invention discloses a phosphorus-doped boron nitride acid-base catalyst and a preparation method and application thereof. The preparation method includes the steps that a solution containing a phosphorus source, a boron source and a nitrogen source is recrystallized to obtain a recrystallization product, the recrystallization product is dried and then roasted at 700-850 DEG C in an inert atmosphere, and after roasting is completed, the phosphorus-doped boron nitride acid-base catalyst is obtained. The prepared phosphorus-doped boron nitride acid-base catalyst is a bifunctional catalyst which has a nanosheet structure with the thickness of 0.8-2 nm and also has acid-base active sites. The catalyst is a non-metal solid acid-base catalyst, has the advantages of being high in acid-base property, good in stability and easy to prepare, and shows excellent activity in one-pot cascade reaction under acid-base catalysis.

The present invention relates to a process for preparing optionally substituted aromatic or heteroaromatic nitriles starting from haloaromatics. These are reacted in a copper-catalysed reaction with potassium hexacyanoferrate(II) or potassium hexacyanoferrate(III) in the presence of heteroaromatic amines.

The invention discloses a catalytic preparation process for aromatic nitrile or heteroaromatic nitrile. According to the process, water is used as a reaction solvent, nanometer cuprous iodide, potassium iodide and N,N'-dimethylethylenediamine are used as a combined catalyst, substituted aryl halide or heteroaryl halide reacts with potassium ferrocyanide at a temperature of 150 to 170 DEG C for 24 to 48 h, and purification is carried out to obtain corresponding aromatic nitrile or heteroaromatic nitrile. Compared with synthetic methods in the prior art, the catalytic preparation process provided by the invention has the following advantages: (1) reaction conditions are mild; (2) reaction process flow is short; (3) a cheap nontoxic cyanated reagent is used, and a wide range of substrates can be used; and (4) industrial-grade aromatic nitrile or heteroaromatic nitrile is easy to use and is more economic and environment-friendly.

The invention provides a preparation method for 2-nitro-4-(trifluoromethyl)benzonitrile. The method comprises the following steps: under the protection of nitrogen, successively adding 3-nitro-4-chlorobenzotrifluoride, cyanide, a catalyst II, a catalyst II and a solvent N-methyl-2-pyrrolidone into a reactor; carrying out heating under mechanical stirring; carrying out a reaction at temperature of 185 to 195 DEG C for 5 to 9 h; and then carrying out rectification so as to obtain 2-nitro-4-(trifluoromethyl)benzonitrile. The cyanide is one or more selected from the group consisting of sodium cyanide, potassium cyanide and cuprous cyanide; the catalyst I is one or two selected from the group consisting of cuprous bromide and nickel bromide; and the catalyst II is methylimidazole ionic liquid. According to the preparation method in the invention, the two catalysts are used and reaction temperature is adjusted in stages, so selectivity and conversion rate of the reaction are improved, cost is substantially reduced, and the preparation method is simple.