175 results about "Carbonyl reduction" patented technology

The invention provides a preparation method of ursodeoxycholic acid. Commercial available chenodeoxycholic acid is taken as raw materials, the ursodeoxycholic acid is obtained by four steps including selective oxidation, esterification, deoxidation and hydrolyzation, and the total yield is 85.7%. In a mixture of acetone and water, NBS is used for selective oxidation of hydroxy at C- 7 bit of the chenodeoxycholic acid, and the selective oxidation possesses excellent selectivity and high yield. NaBH14/CeC13 may be used to deoxidize carbonyl at C-7 bit into hydroxy, and the ratio of alpha/beta is as high as 5/95.

The invention provides a method for preparing an anti-depression medicine vilazodone, which comprises the following steps of: performing nitro reduction on 5-nitrobenzofuran-2-ethyl carboxylate serving as a raw material, conjugating with chlorohydrin, chlorinating by using phosphorus trichloride, cyclizing with 4-aminobutyric acid to generate a piperazine ring, performing acylchlorination, condensing with halogenated indole, performing carbonyl reduction, cyaniding, performing amidation, and the like to obtain the vilazodone. The method overcomes the defects in the prior art, is suitable for industrial production and has high application value, the used raw material is readily available, operating cost is low, and reaction yield is high.

The invention discloses a gene of dicarbonyl reductase. The nucleotide sequence of the gene has over 80 percent of homology with SEQ ID NO.1. The dicarbonyl reductase consists of an amino acid sequence having over 80 percent of homology with SEQ ID NO.2. The obtained dicarbonyl reductase can be used for a reaction of catalyzing a dicarbonyl compound to be reduced into a dicarbonyl product, and has high stereo-selectivity.

The invention discloses a method for catalytically synthesizing an atazanavir intermediate, which comprises the following steps: preparing a magnetic modified mesoporous material, co-immobilizing a carbonyl reduction enzyme and a coenzyme in the magnetic mesoporous material, and catalyzing (3S)-3-(tert-butyloxycarbonyl)amino-1-chloro-4-phenyl-(2R)-butanone by using the immobilized enzyme to generate the (3S)-3-(tert-butyloxycarbonyl)amino-1-chloro-4-phenyl-(2R)-butanol intermediate. The method has the advantages of high recovery rate of the carbonyl reduction enzyme and coenzyme, high regeneration efficiency of the coenzyme, low cost, wide market prospects and the like.

The invention discloses a preparation method of a silodosin intermediate, wherein the structure of the silodosin intermediate is represented as the formula A. The preparation method, wherein indoline is employed as a start raw material, includes the reactions of Friedel-Crafts acylation, carbonyl reduction, Gabriel reaction and chiral resolution and the like. The preparation method is simple in operation, is low in cost, is high in yield, allows the product to purify easily and is stable in processes, and is suitable for industrial production. The invention also discloses a new intermediate compound which is related in the method.

The invention discloses a long-branched-chain polysulfone anionic membrane and a preparation method thereof. The structure of the membrane material is disclosed in the specification. The preparation method comprises the following steps: polysulfone acylation, carbonyl reduction, quaternization, film formation, alkalification and the like. Compared with the traditional anion-exchange membrane sequentially subjected to quaternization and functionalization, the polysulfone anion-exchange membrane contains the long branched chain on the side chain, so that the hydrophilic group is far away from the hydrophobic polymer main chain, thereby enhancing the phase separation driving force in the film formation process, improving the connectivity of the ion channels in the membrane and further enhancing the hydroxide ion conductivity of the membrane. The long alkyl side chain can obviously reduce the degree of swelling of the quaternary ammonium salt membrane and reduce the nucleophilic attack of water or OH-. The long-branched-chain polysulfone anionic membrane can obtain higher ion conductivity on the premise of relatively lower water absorptivity, thereby solving the contradiction in the anionic membrane for a long time.

The invention discloses a process for synthesis of asenapine. The asenapine is prepared through adopting a compound (18) as a key intermediate and carrying out the following steps that: 1.1, the compound 18 is subjected to a Ullmann reaction under a alkaline condition through adopting copper powder as a catalyst to generate a ether (19); 1.2, the ether (19) is subjected to a carbonyl reduction to obtain the target compound of the asenapine (1). The process has the following advantages that: cheap and available 2-bromobenzaldehyde is adopted as an initial raw material and is subjected to acondensation, a addition, a reductive amination and a intramolecular cyclization reaction, a aminomethylation, a open loop transposition and then loop closing, a demethylation and a Ullmann loop closing reaction to synthesize of the asenapine (1); cis-trans-isomer is subjected to a delicate transposition to obtain a trans-product, such that the process is simplified and easy to be operated; the raw material is easy to be obtained and has cheap price; each reaction is a normal reaction, and reaction conditions are mild; a total yield is substantially improved; production cost is reduced; a purity of the product is more than 99% through a detection by HPLC.

The invention discloses a preparation method of 3-(4-chlorobutyl)-5-cyanoindole which is shown as the formula IV. The preparation method comprises the steps as follows: carrying out following carbonyl reduction reaction on a compound III and a hydroboron reducing agent in the solvent under the catalyzing of Lewis acid to obtain the product, wherein Lewis acid is one or more of aluminium trichloride, magnesium chloride, zinc chloride and ferric chloride; and the hydroboron reducing agent is one or more of sodium borohydride, potassium borohydride, lithium borohydride and borane. The preparation method disclosed by the invention is safe in operation, low in requirement on equipment, low in cost, simple in post-processing steps, high in yield of product, high in purity, and is suitable for industrialization.

The invention belongs to the technical field of medicine, and discloses a preparation method of (3S,2'S), (3S,2'R), (3R,2'R) and (3R,2'S) four type chiral monomers of muscarine receptor antagonist racemic medicine glycopyrronium bromide. The method comprises the following steps: resolving racemic alpha-cyclopentylmandelic acid by a chemical resolution method by using L-Tyrosine methyl ester and (R)-alpha-phenylethylamine as resolution reagents to respectively prepare (S)-alpha-cyclopentylmandelic acid and (R)-alpha-cyclopentylmandelic acid; and carrying out esterification reaction to respectively obtain chiral intermediates (S)/(R)-alpha-cyclopentylmethyl mandelate. L/D-malic acid used as the raw material is subjected to four reaction steps, including condensation, carbonyl reduction, catalytic hydrogenation or transfer hydrogenation reduction debenzylation, and reduction alkylation or alkylogen alkylation, in a chiral synthesis mode to obtain another important chiral intermediate (S)/(R)-N-methyl-3-hydroxypyrrolidine. The chiral intermediate is subjected to ester exchange and quaterisation to respectively obtain the four (3S,2'S), (3S,2'R), (3R,2'R) and (3R,2'S) type glycopyrronium bromide chiral monomers. The result indicates that the (3R,2'S)-glycopyrronium bromide has the strongest cholinergic antagonistic action.

The invention discloses a synthesis method of indenofluorene derivatives, isotruxene and mono-substituted isotruxene derivatives. The synthesis method of indenofluorene derivatives is characterized in that ester-group-containing compounds are formed through Diels-Alder reaction of methyl propiolate and indenocyclopentadienone, ethyl substituted indenofluorene derivatives are formed through hydrolysis, acid catalytic ring closing, carbonyl reduction and introduction of ethyl onto methylene, diketone compounds produced after ring closing react with lithium salt of 4, 4'-di-tert-butyl-2-brominated biphenyl, and then acidification and ring closing are conducted to obtain indenofluorene derivatives with spirofluorene. The synthesis method of isotruxene is characterized in that 1, 4-diphenyl-2, 3-di (carbalkoxy) fluorenone products are formed through the Diels-Alder reaction of indenocyclopentadienone and dimethyl acetylenedicarboxylate, isotruxene ketone is obtained through hydrolysis and acid catalytic ring closing and finally isotruxene is obtained; dibenzyl alcohol products are formed through the Diels-Alder reaction of 1, 4-butynediol and indenocyclopentadienone, and isotruxene is obtained through acetone protection, carbonyl reduction, acetone removal and polyphosphoric acid (PPA) ring closing; and oriented oxy substituted products, i.e. isotruxene ketone which is derived from isotruxene with methylene at a No.5 position being substituted, and corresponding diethyl substituted products are additionally obtained. The indenofluorene derivatives, the isotruxene and the mono-substituted isotruxene derivatives disclosed by the invention can be used in the field of organic electroluminescence and organic micro-molecule solar cells.

The invention relates to gene order and amino acid component of (S)-carbonyl reductase of Candida parapsilosis CCTCC M203011, and the (S)-special carbonyl reductase gene can be used in separating recemic compound with biological method, which belongs to biological engineering sphere. The invention is to confirm (S)-special carbonyl reductase of Candida parapsilosis CCTCC M203011, its gene nucleotide sequence is SEQ ID NO:1, and its amino acid component is SEQ ID NO:2. By this gene, the recombination strain can be used in racemic chirality resolution and can arrange conditions for the heterogeneity, conversion approach and reaction mechanism of the microbial stereoselectivity oxidoreductase used in chirality resolution.

The invention relates to a method for synthesizing a novel triazolone and a triadimenol compound, namely, benzene or substituted benzene is used as a raw material and subjected to Friedel-Crafts acylation, Tolyltriazole alkylation and halogenous-benzylation to obtain the novel triazolone compound; then carbonyl reduction is carried out to obtain the novel triadimenol compound. The invention also relates to medical and pesticide applications of the novel triazolone and triadimenol compounds.

The invention discloses a method for preparing nebivolol racemate hydrochloride and belongs to the technical field of pharmaceutical synthesis. The method includes that a formula I compound and a formula II compound are used as raw materials to be subjected to an acyloin condensation to prepare a formula III compound, the formula III compound is subjected to an epimerization reaction to increase the ratio between III a and III b from 1:1 to 9:1, the formula III compound is subjected to a recrystallization purification to obtain a high purity III a, the III a is subjected to a carbonyl reduction to generate a formula IV compound, the formula IV compound is directly subjected to a catalytic hydrogenation to remove a benzyl protecting group to obtain a nebivolol racemate crude product, the nebivolol racemate crude product is directly salified by hydrogen chloride, and the recrystallization is performed to obtain the high purity nebivolol racemate hydrochloride. According to the method, the reaction is easy to control, the postprocessing is easy, and the production efficiency is high.

The invention discloses a method for preparing obeticholic acid, 7-ketolithocholicacid and ursodeoxycholic acid. Cholic acid is used as a raw material for preparing obeticholic acid through selectiveprotection by a 3-alpha-hydroxyl group, selective oxidation of a 7-alpha-hydroxyl group, esterification of a 24th carboxyl group, methanesulfonation of a 12-alpha-hydroxyl group, elimination, hydrolysis, silylation, condensation, hydrolysis, catalytic hydrogenation, carbonyl reduction and other reactions; an intermediate is subjected to catalytic hydrogenation to prepare the 7-ketolithocholicacidand then is reduced to prepare the ursodeoxycholic acid. The method provided by the invention uses cheap cholic acid as the raw material, and has advantages of novel synthesis method, low cost, high yield, mild reaction condition, high simplicity in operation, environmental friendliness and high convenience in industrial production.

The invention discloses the compounding method for hydrochloric acid Gemcitabine. It uses D-mannitol as raw material and takes the processes of hydroxyl protection, oxidation, and addition of reformatsky, hydroxy benzoylation, hydrolysis, hydroxyl sulfonylation, ring closure, carbonyl reduction, hydroxyl sulfonylation, condensation, hydrolysis and crystallization to gain hydrochloric acid Gemcitabine. It has the advantages of high yield, simple operation, and is suitable to industrial producing.

The invention provides a synthetic method of pentacycloundecane (PCUD). The method uses cyclopentadiene and benzoquinone as initial raw materials, and a high boiling solvent; and the pentacycloundecane is synthesized through the following three reactions: Diels-Alder addition, ultraviolet cyclization and carbonyl reduction. According to the invention, the Diels-Alder addition, the ultraviolet cyclization and the carbonyl reduction can be continuously carried out without post-treatment, and unnecessary processes in the reactions is simplified, thereby achieving purposes of improving efficiency and reducing cost. The method has advantages of short period, low cost and easily expanded technology; and the synthesized target compound PCUD can be used as a high-energy additive for fuel of solid turbine stamping engines or liquid rocket fuel.

The invention discloses a preparation method for hypoglycemic drugdapagliflozin. The method comprises the steps that 4-hydroxybenzaldehyde is adopted as a starting raw material, alkylation, carbonyl reduction, chlorination and alkylation reaction with asepsin, diazotization and chlorination are performed to obtain a dapagliflozinmidbody 5-bromo-2-chloro-4'-ethyoxyl diphenylmethane, then, the midbody and 2,3,4,6-tetra-O-trimethyl silicone-D-glucolactone are subjected to condensation, etherification and methoxyl removal to obtain the hypoglycemic drugdapagliflozin. The raw materials adopted by the technological path are low in price and easy to obtain, the technology can achieve industrialization easily, and the final product is high in purity; the technological path is novel, the syntheticroute is short, no risky or complex technology exists in the reactions, equipment is simple, operation is easy and convenient, and the method is suitable for industrial production.

The invention relates to a preparation method of high-purity obeticholic acid. A compound chenodeoxycholic acid (CDCA) shown as a formula II is used as a starting raw material and subjected to oxidation, esterification, hydroxy protection, ethylidene formation, catalytic hydrogenation, carbonyl reduction and esterolysis reaction to obtain the high-purity obeticholic acid. The preparation method of the high-purity obeticholic acid, provided by the invention, has the advantages of low toxicity, low pollution, high purity, good stereoselectivity, low content of impurities, mild reaction conditions, high safety, simplicity and convenience in production operation and the like, and is suitable for industrial production.

The invention relates to promotion of synthesis of (R)-styrene glycol by coupling (R)-carbonyl reductase and formic dehydrogenase, which belongs to the technical field of asymmetrical transformation of biological catalysis. The invention provides a recombinant Escherichia coli, namely E.coli Rosetta/ pETDuet-rcr-fdh, with a preservation number of CCTCC NO: M208123, wherein the (R)-special carbonyl reductasei and the formic dehydrogenase are coupled by a co-expression mode; asymmetrical transformation reaction is catalyzed by utilizing a cultured recombinant strain and taking 2-hydroxyacetophenone as a substrate; and the optical purity of the (R)-styrene glycol reaches 100 percent e.e., and the yield of the (R)-styrene glycol reaches 85.9 percent by optimizing the biotransformation reaction conditions. The invention utilizes double-enzyme coupling technology to solve the problem of limitation of regeneration cycle of coenzyme under the condition of high-concentration substrate, provides an effective path for high-efficiency and low-cost preparation of the (R)-styrene glycol, and lays a foundation for industrial application of the biosynthesized (R)-styrene glycol.

A method for preparing (S)-phenylethylene glycol by coupling of carbonyl reductase and pyrimidine nucleotide transhydrogenase, which belongs to the technical field of biocatalysis asymmetric transformation. In the invention, (R)-carbonyl reductase, (S)-carbonyl reductase and pyrimidine nucleotide transhydrogenaseA, B are respectively constructed to two co-expression vectors, and the constructed recombinant plasmid pETDuet-rcr-scr and pACYCDuet-pnta-pntb are co-transformed into Escherichia coli to obtain recombinant strain E. Coli BL21(pETDuet-rcr-scr/pACYCDuet-pnta-pntb). The accession number is CCTCC NO: M208126. The recombinant strain not only realizes one-step transformation from substrate (R)-phenylethylene glycol to product (S)-phenylethylene glycol, but also removes a restriction of coenzyme regeneration cycle in a transformation reaction. The method provides an effective way for producing chiral alcohol through catalytic reaction of enzyme and regeneration of in-situ coenzyme under high substrate concentration.

The invention discloses a dual-function catalyst for hydrogenating benzene rings and reducing carbonyl. The dual-function catalyst comprises, by weight, 10-60% of copper oxide, 10-60% of nickel oxide, 28-80% of carriers and 0-2% of catalysis assisting components. The catalysis assisting components include at least one type of ZnO, MnO2, Cr2O3, MgO and Fe2O3. The invention further discloses a method for preparing the dual-function catalyst and application of the dual-function catalyst to catalytically hydrogenating the benzene rings, hydrogenating and reducing the carbonyl and preparing 1, 4-cyclohexyl dimethyl carbinol.

The invention discloses a method for preparing (2R,4R)-4-methyl-2-pipecolic acid (I). The method comprises the following steps that: L-aspartic acid is subjected to selective esterification to obtain L-aspartic acid-4-alkyl ester hydrochlorate (II); the resulting (II) and acrylate are subjected to a reaction and an amino protection reaction to generate N-(2-carboalkoxy(aryloxy))ethyl-N-protective group-L-aspartic acid-4-alkyl ester (III); the resulting (III) is subjected to intramolecular ring closing and decarboxylation under an alkaline environment to generate (R)-N-protective group-4-oxopiperidine-2-formic acid (IV); the carboxyl of the resulting (IV) is subjected to esterification to generate (R)-N-protective group-4-oxopiperidine-2-formate (V); the resulting (V) is subjected to selective carbonyl reduction under an effect of a reducing agent to generate cis (2R,4S)-N-protective group-4-hydroxypiperidine-2-formate (VI); the hydroxyl of the resulting (VI) is activated to generate cis (2R,4S)-N-protective group-4-oxysulfonyl piperidine-2-formate (VII); the resulting (VII) and a nucleophilic methyl metal reagent SN2 are subjected to a substituted reaction to generate trans (2R,4R)-N-protective group-4-methyl piperidine-2-formte (VIII); and amino in the compound (VIII) and the protective group on the acid are removed to generate a target compound (2R,4R)-4-methyl-2-pipecolic acid (I). The method of the present invention has advantages of low cost, environmental friendliness, high selectivity, high yield, and the like, and is suitable for industrial production.

The present invention provides an obeticholic acid derivative and an obeticholic acid preparation method, wherein configuration transformation of a compound represented by a formula III, carbonyl reduction and amide hydrolysis are performed to obtain obeticholic acid. According to the present invention, the route has characteristics of simple operation, convenient post-treatment, and high yields and high purities of intermediates in each step.