39results about How to "No racemization" patented technology

The invention provides a method for preparing (L)-pantoprazole sodium, which comprises the following steps of: oxidizing 5-difluoromethoxy-2-{[(3,4-dimethoxy-2-pyridinyl)methyl]thio}-1H-benzimidazole by using 3,5-diisopropylbenzene hydroperoxide under the catalysis of a tetraisopropyl titanate, D-(-)-diethyl tartrate and N,N-diisopropylethylamine system to obtain S-(-)-5-difluoromethoxy-2-{[(3,4-dimethoxy-2-pyridinyl)methyl]sulfinyl}-1H-benzimidazole, namely (L)-pantoprazole, refining the (L)-pantoprazole, and preparing a salt to obtain the (L)-pantoprazole sodium.

The invention aims to overcome the defects of complicated synthetic process, great harm to human body and high production cost of L-alanyl-glutamine compound in the prior art, and the synthetic method of the L-alanyl-glutamine compound with simple process, low cost, high productivity and less harm is provided. The invention provides the synthetic method of the L-alanyl-L-glutamine compound, which comprises the following steps: (1) adding a chloroformate isobutyl ester to a tetrahydrofuran solution of N-formacyl L-alanine to obtain N-formacyl-L-alanyl-L-glutamine, and (2) suspending the N-formacyl-L-alanyl-L-glutamine in hydrochloric acid to prepare the L- alanyl-L-glutamine compound.

The invention discloses a method for preparing levodopa by virtue of an enzymic method. The method comprises the following steps: picking up an annular stenotrophomonas maltophilia strain slant for inoculation into a seed culture medium for culturing, thereby obtaining a primary seed liquid; inoculating a fermentation culture medium with the primary seed liquid at the inoculum size of 3-10% for fermentation culturing, centrifuging after the fermentation is ended and collecting bacterial cells; and adding tyrosine and the bacterial cells to a buffer solution to have an enzymatic reaction under the conditions of 18-30 DEG C and the pH of 5.0-6.0, thereby converting the tyrosine into the levodopa. According to the method, due to the resting cell transformation technology, and the preferred intermittent weak ventilation technology, adopted in the transformation process, the catalytic efficiency of the enzyme is improved; the concentration of the levodopa is 27g/L and the molar transformation rate of the tyrosine is above 99%; and besides, the method is mild in conditions, high in enantio-selectivity and free from racemization effect, is more suitable for industrial production, and has remarkable economic benefit and industrial application value.

The invention provides a method for preparing (S)-ornidazole. The method comprises the following steps of: adding an organic solvent and 2-methyl-5-ornidazole, slowly adding a catalyst dropwise with stirring first, then slowly dripping S-(+)-epichlorohydrin into the mixed solution, and after the S-(+)-epichlorohydrin is dripped completely, performing a reaction for 2 to 10 hours at the temperature of between 0 and 20 DEG C; slowly adding the reaction solution into the ice-water mixture, stirring the mixed solution for a reaction for 10 minutes and 5 hours at the temperature of no less than 30 DEG C, adjusting a pH value of the mixed solution to 1.0 to 2.0 with acid, removing an organic layer, adjusting the pH value of a water layer to 6.0 to 8.0 with alkali, stirring the mixed solution for 1 to 24 hours for crystallization, filtering the reaction solution, washing the product obtained by water, and drying the product to obtain the (S)-ornidazole. The method has the advantages of high product purity, simplified procedures and the suitability for industrial production.

The invention discloses a method for preparing furanone compounds, and provides a method for preparing a furanone compound III. The method includes the following steps that in a solvent, in the presence of inorganic salt, a compound II and a reducing agent are subjected to a reduction reaction, and the furanone compound III is obtained; the solvent is a fatty alcohol solvent or a mixed solvent of a fatty alcohol solvent and water. The brivaracetam can be prepared with the furanone compound III only with the three steps, and the synthetic route is short; the ee value of the compound II is larger than 99.0%, racemization does not occur in the reaction process, and the de value of a brivaracetam I crude product is larger than 99.0%; the brivaracetam I crude product is further purified through a crystal instead of a chirality high-pressure-liquid-phase preparing column, and the chirality purity of brivaracetam I can be further increased to be the de value of 99.80% or above; meanwhile, the content of other individual impurities of the brivaracetam I is smaller than 0.1%, and reaches the API level, and the method is suitable for industrial production. The formula is defined in the description.

The invention provides a synthetic method of (S)-(+)-3-hydroxytetrahydrofuran. The synthetic method comprises the following steps: (1) with L-malic acid as a raw material, carrying out esterification on two carboxyls of the L-malic acid to obtain a product with a formula shown in the specification; (2) reducing a product in the first step by virtue of sodium borohydride to obtain a product with a formula shown in the specification; and (3) carrying out cyclization on a product obtained in the second step to obtain the (S)-(+)-3-hydroxytetrahydrofuran. According to the synthetic method provided by the invention, the synthetic route is short in step, the used raw materials are cheap and easy to acquire, no racemization phenomenon occurs in the reaction process, a by-product in the third step is easy to remove, the total yield is high, and the (S)-(+)-3-hydroxytetrahydrofuran is suitable for industrial production.

The invention relates to a production method for cyclic dipeptide, and belongs to a natural compound synthesis technology. Cyclic (histidine-proline) dipeptide is prepared by a cooling varying-temperature synthesis and high-pressure high-temperature water phase cyclizing technology. The production method comprises the following steps: taking hydrochloride of histidine proline dipeptide methyl ester as a raw material, and synthesizing high-quality and high-purity cyclic histidine-proline dipeptide by a high-pressure high-temperature assisted method in water containing strong basic and weak acidic salt. Compared with a conventional methanol reflux method, the production method is time-saving, efficient, high in product yield and free of racemization phenomenon.

The invention belongs to the field of biopharmaceuticals, and relates to a method for extracting concentrated S-adenosylmethionine. The method uses a new synchronous analytic supported liquid membrane separation technology; in a supported liquid membrane separation system, a feed phase, a first order analytic phase and a second order analytic phase are aqueous solution phases, and are connected with a water-immiscible organic liquid membrane to form an immiscible multiphase system, and all phases are connected into a whole by an interfacial chemical reaction; and an organic solution containing an extraction agent is adsorbed in a microporous support body of a hydrophobic hollow fiber membrane by a supported liquid membrane under the action of intermolecular force and capillaries, and a substance to be separated is transferred to the analytic phase through the liquid membrane phase from the feed phase by utilizing an interface coordination chemistry reaction at both sides of the liquid membrane, a facilitated transport action generated in the liquid membrane, and an analytic reaction between the liquid membrane phase and analytic phase interfaces. According to the method, emulsifying and demulsifying working procedures are eliminated, so that the separation process is simpler, more reliable and more practical, the cost is greatly reduced, and the large-scale production is easy to implement.

The invention discloses a method for reducing amide compounds, which reduces various amides through low valent tiron. Low valent tiron prepared by reducing titanium tetrachloride through magnesium powder is reacted with amide in tetrahydrofuran at 0 DEG C or normal temperature so as to obtain corresponding amine. The method has the advantages that the reaction condition is mild, reagent adopted is chip and easy to get, the method is convenient to operate, substrate has a wide applicable scope, functional group has good compatibility, the reaction is rapid, and the yield is high.

The invention discloses amino acid organic liquid fertilizer and a preparation method thereof. The amino acid organic liquid fertilizer is prepared from the following components in parts by weight: 90to 110 parts of poultry feather, 4 to 6 parts of glucose, 4 to 6 parts of biogas slurry, 15 to 20 parts of macro elements, 1 to 5 parts of trace elements and 0.8 to 1.5 parts of chelating agent. Thepreparation method comprises the following steps: adding the glucose into the biogas slurry, fermenting in a closed manner to obtain a fermented solution; then adding the poultry feather into the fermented solution, fermenting in a closed manner to prepare an amino acid solution, then adding the chelating agent, macro elements and trace elements into the amino acid solution to react, finally cooling to the room temperature, thus obtaining the amino acid organic liquid fertilizer. The amino acid organic fertilizer is prepared by adopting microorganisms to ferment the poultry feather. By adopting the preparation method, no racemization effect is produced, the environment is not polluted, the production cost is low, the obtained amino acid is high in biological activity and low in content oftoxic and harmful articles; and meanwhile, the amino acid organic liquid fertilizer provided by the invention is easier to absorb by crops, so that the resource waste can be reduced.

The invention discloses a synthesizing process of (S)-2-benzyloxy-pentan-3-one. The synthesizing process comprises the following steps: (1) mixing ethyl lactate with nafoxidine in proportion and performing a reflux reaction for 12 to 48 hours, thereby generating an amide compound; (2) mixing the amide compound with benzyl chloride, alkali and a solvent and reacting, cooling to normal temperature after the reaction, washing an organic layer by using water, concentrating the organic layer under reduced pressure and removing primary distillates, thereby obtaining benzyl-protected amide; and (3) dripping a tetrahydrofuran solution of the benzyl-protected amide into a tetrahydrofuran solution of ethylmagnesium bromide and reacting, adjusting the pH value by using an acid solution after the reaction, extracting a water layer after layering, combining the organic layers, drying, filtering and concentrating filtrate until the filtrate becomes dry, thereby obtaining (S)-2-benzyloxy-pentan-3-one. The synthesizing process is relatively simple to operate, high in safety and low in raw material cost, thereby satisfying the industrial amplification requirement.

The invention discloses a preparation method for chiral 4-cyano-3-hydroxybutyrate. The preparation method specifically comprises that: under the effect of a carbonylation catalyst, chiral chloropropylene oxide is taken as an initial raw material, and reacted with an alcohol and carbon monoxide for a carbonylation reaction, and corresponding chiral 4-chloro-3-hydroxybutyrate with maintained configuration is obtained and then subjected to cyanidation for preparation of chiral 4-cyano-3-hydroxybutyrate with high optical purity. Compared with conventional synthetic methods, the preparation method has the advantages of fewer steps, easily available and cheap raw materials, fewer 'three wastes (waste gas, waste water and industrial residue) ', simple post treatment, low equipment requirements, and applicability to industrial production.

The invention provides a normal pressure crystallization method for monosodium glutamate, aiming to solve the problems that a great amount of pyroglutamic acid and racemized glutamic acid can be generated because temperatures of upper and lower parts of a sodium glutamate solution are different in the current monosodium glutamate crystallization method. The invention has the keypoint that: the crystallization process is finished in normal pressure crystallization equipment, a heating and evaporating process is finished in negative pressure heating and evaporating equipment, the normal pressure crystallization equipment and the negative pressure heating and evaporating equipment are connected end to end by a pipeline, and a pressure pump and a feed inlet are arranged on the pipeline between the normal pressure crystallization equipment and the negative pressure heating and evaporating equipment. The normal pressure crystallization method for monosodium glutamate provided by the invention has the beneficial effects that: monosodium glutamate can be crystallized under a normal pressure, the crystallization temperature is kept at 55-60 DEG C all the way, the generation of the pyroglutamic acid can be reduced furthest, and racemization of glutamic acid can be avoided.

The invention discloses a synthesis method of N-benzyl-alpha-methylbenzylamine. According to the method, phenylethylamine, benzaldehyde, KBH4, (NH4)2Mo7O24, Ni(NO3)2, 4,4'-dipyridyl, urea formaldehyderesin and H3PMo12O40 are used as main raw materials. The synthesis method is used for carrying out nucleophilic addition through phenylethylamine and benzaldehyde under the action of a catalyst whichis P-Mo2Ni/NC and then further reducing to obtain N-benzyl-alpha-methylbenzylamine. Compared with the conventional synthesis method, the synthesis method has the advantages that limited carbonizationof polyacids is capable of effectively avoiding excessive growth of metal carbide particles; nano-sized monodispersed catalyst particles can be obtained; racemization is not generated when KBH4 is used as a reducing agent for reducing intermediate products which are imine materials; and phenylethylamine with two configurations and extremely high optical purity can be easily obtained.

The invention provides a preparation and purification method of a pantoprazole optical antimer. The method comprises the following steps: carrying out a reaction on 5-difloromethoxyl-2-{[(3, 4-dimethoxyl-2-pyridyl)methyl]sulfur}-1H-benzimidazole and optically active diethyl tartrate (D-(-)-diethyl tartrate or L-(+)-diethyl tartrate) according to different feeding sequences; reacting completely within 2 hours and filtering to obtain optically active pantoprazole; then, purifying to obtain a pure product S-(-)-pantoprazole or R-(+)-pantoprazole. The method provided by the invention is simple and convenient to operate, higher in product purity and high in yield, and the reaction time is shortened and the production cost is saved, so that the method is more suitable for industrialized large-scale production.

The invention provides a method for efficiently preparing carfilzomib, which comprises the following steps: by taking chloroacetic acid, homophenylalanine, phenylalanine, leucine and (2S)-2-amino-4-methyl-1-[(2R)-2-methyl oxiranyl]-1-pentanone trifluoroacetate as raw materials and phenyl allene ketone as a condensation reagent, carrying out a condensation reaction to obtain carfilzomib; carrying out step-by-step coupling condensation through the steps of carboxylic acid activation, condensation, carboxyl protecting group removal and the like to obtain an intermediate product, and then carrying out catalytic condensation reaction on the intermediate product and morpholine to obtain a target compound. The condensing agent used in the method has the advantages of simplicity in preparation, small molecular weight and no racemization when the chiral carboxylic acid is activated. Meanwhile, the method is mild in reaction condition and simple to operate, the total yield is up to 68-72%, and the method has excellent atom economy and is a novel, efficient and very practical synthesis method of carfilzomib.