110 results about "Brivaracetam" patented technology

The invention provides a preparation method of brivaracetam. The preparation method of brivaracetam comprises the following steps of in an alkaline reagent, reacting malonate ester and (R)-epichlorohydrin to obtain lactone (II), reacting the lactone (II) and an ethyl metal-based reagent to obtain an intermediate (III), removing carboxylase to obtain (R)-4-propyl-dihydrofuran-2-ketone (IV), performing ring-opening reaction under the action of a halogenated ring-opening reagent to obtain (R)-3-halogenarated methyl hexanoate or (R)-3- halogenarated methyl hexyl acetate (V), and reacting with (S)-2-aminobutanamide or an acceptable salt, so as to obtain the brivaracetam. The preparation method has the advantages that the high-purity brivaracetam (HPLC (high performance liquid chromatography: greater than 96%) and stereo rotary brivaracetam (chirality HPLC: greater than 98%) can be directly prepared; the silicagel column separation and purification or the chirality preparation column separation and purification is not used, so that the complicated separation and purification step is not performed, the cost is saved, and the preparation method is more suitable for industrial production.

The invention provides a compound shown in the formula I and a preparation method thereof. The invention also provides a use of the compound shown in the formula I in brivaracetam synthesis and a synthesis method of brivaracetam. The synthesis method utilizes cheap and easily available raw materials and can produce high optical purity brivaracetam.

The invention relates to a preparation method of brivaracetam and an intermediate thereof, wherein the brivaracetam is prepared with high-optical-purity (R)-4-n-propyl-dihydrofuran-2-one as a raw material. The preparation method is low in requirement on production equipment and can be used for preparing a brivaracetam crude product at higher chemical and optical purities and higher yield. The method greatly reduces the cost of large-scale industrial production of the brivaracetam.

The invention provides a preparation method of a high chiral purity lactam intermediate. The preparation method of the high chiral purity lactam intermediate specifically includes the steps of: conducting hydrogenation reduction on a formula I compound under the conditions of a catalyst and a chiral inducer to generate a formula II compound with a de value of greater than 98%. The invention also discloses a preparation method of brivaracetam, and the formula II compound can produce a brivaracetam product under an ammoniation condition. The method provided by the invention has the advantages ofsimple operation of process route, low cost, high yield, high chiral purity of product, easy industrial production and the like.

The invention provides a synthesis method of brivaracetam. The method adopts cheap and easily available pentanoic acid or valeryl halide as an initial raw material, and provides a brand new synthesis route of a brivaracetam medicine, and the whole reaction route has a high total yield. The method has the advantages of high productivity, low cost, and suitableness for large-scale industrial production.

The invention discloses a synthesis method of a brivaracetam intermediate and brivaracetam. The synthesis method of the brivaracetam intermediate includes the steps of stripping carboxyl, triggering ahydrogenation reaction, and then conducting chiral resolution to obtain the brivaracetam intermediate which can be used for further synthesis of brivaracetam, wherein specific information is shown inthe description. According to the synthesis method of the brivaracetam intermediate, applied raw materials are easy to obtain, reaction operation is simple, and reaction conditions are easy to control. The synthesis method of brivaracetam is high in yield, the purity of synthesized brivaracetam can reach 99% or above, and the overall synthesis cost is lower.

The invention discloses a preparation method of a brivaracetam intermediate. The preparation method comprises the following steps: performing reaction on 4-n-propyl-2(5H)-furanone as a substrate in anaqueous buffer solution of which temperature is 25 to 30 DEG C and a pH value is 6.0 to 9.0 under effects of recombinant alkene reductase and coenzyme as well as a coenzyme regeneration system to generate an intermediate (R)-4-n-propyl-dihydrofuran-2-one. According to the preparation method disclosed by the invention, by adopting specific alkene reductase, the problems of long synthetic route, low yield and high cost of an existing brivaracetam intermediate (R)-4-n-propyl-dihydrofuran-2-one and large environment protection pressure caused by adopting a toxic and dangerous reagent are solved,and the brivaracetam intermediate in the prior art has important industrial application value.

The invention discloses a preparation method of brivaracetam (formula IV). The preparation method comprises the following steps: carrying out ammonolysis on (R)-4-propyl-dihydrofuran-2-one and (S)-2-amino butyric acid as raw materials to obtain an intermediate II, then carrying out steps of esterification, chlorination and cyclization to obtain an intermediate III, and finally, carrying out an ammonolysis step to obtain the brivaracetam (IV), wherein the steps of esterification, chlorination and cyclization are operated in a combination mode. The preparation method provided by the invention ismild in condition, is simple and convenient to operate, has easily obtained raw materials, and is suitable for large-scale industrial production.

The invention relates to an antiepileptic drug brivaracetam chiral intermediate and a preparing method thereof. The preparing method of a compound, shown in a formula 1, of the brivaracetam chiral intermediate comprises the steps of with S-epichlorohydrin (a compound shown in a formula 7 being an original raw material, conducting open-loop preparing on ethyl metal reagent under the effect of Lewisacid to obtain a compound shown in a formula 6; conducting preparing on the compound shown in the formula 6 in the presence of a metal catalyst through a substitution reaction to obtain a compound shown in a formula 5; conducting cyan alcoholysis on the compound shown in the formula 5 under the effect of acid to obtain a compound shown in a formula 4; preparing the compound shown in the formula 4through the effect of hydroxyl activity reagent to obtain a compound shown in a formula 3; conducting preparing on the compound shown in the formula 3 and nitromethane through an SN2 nucleophilic substitution effect to obtain a compound shown in a formula 2; conducting cyclization preparing on the compound shown in the formula 2 through the effect of concentrated sulfuric acid and an Nef reactionto obtain a compound shown in a formula 1, namely the brivaracetam chiral intermediate. By means of the preparing method, the compound high in optical purity and shown in the formula 1 can be prepared and solve the problem that currently produced brivaracetam needs complex unit operation high in cost like a column chromatography and a chiral preparation column.

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 discloses a preparation method of a brivaracetam isomer (2S,4S). The preparation method comprises the following step: in an alcohol solvent, carrying out a salt forming reaction as shownin a formula (shown in the specification) on a compound I and a resolving agent to obtain a compound as of a formula S, wherein the resolving agent is (+)-camphorsulfonic acid, D-(+)-camphanic acid,L-(-)-dibenzoyltartaric acid, D-(+)-dibenzoyltartaric acid, L-(-)-tartaric acid, L-(-)-phenylalaninol or S-(-)-phenylethylamine. The preparation method provided by the invention is low in price and easily available in raw material and mild in reaction condition. By adopting a chemical resolution method, a chromatographic column is not used, so that the preparation method is simple to operate, lowin cost and suitable for production on a large scale. The formula is as shown in the description.

The invention relates to a brivaracetam oral controlled-release preparation and a preparation method thereof. The controlled-release preparation is a single-chamber osmotic pump controlled-release preparation, and is composed of a drug tablet core, a membrane-controlled coating system and a drug-release hole. The drug tablet core comprises 30-60wt% of brivaracetam, and the membrane-controlled coating accounts for 3-8 (w/w, %) of the total preparation. The controlled-release preparation disclosed by the invention has an in-vitro zero-level constant-speed drug release curve, can form a sphericalpreparation after water absorption swelling, and is not prone to being adhered to the wall of a digestive tract to cause too high local drug concentration.

The invention provides a compound, 3-(((S)-1-amino-1-oxobutyl-2-yl)amino)methyl)hexanoic acid (I) and a preparation method thereof. The compound (I) comprises (R)-3-(((S)-1-amino-1-oxobutyl-2-yl)amino)methyl)hexanoic acid (I)-R, or (S)-3-(((S)-1-amino-1-oxobutyl-2-yl)amino)methyl)hexanoic acid (I)-S, or a mixture of (I)-R and (I)-S in any proportion. The compound shown in the formula (I) can be used for synthesizing brivaracetam, and a new thought and a new method are provided for designing a concise and efficient route for synthesizing brivaracetam.

The invention relates to the technical field of medical intermediates, in particular to ketene reductase and a preparation method of a brivaracetam intermediate. The preparation method comprises the following steps of enabling valeraldehyde and glyoxylic acid to react under the catalysis of morpholine to generate 5-hydroxy-4-n-propyl-2(5H)-furanone; enabling the 5-hydroxy-4-n-propyl-2(5H)-furanoneto remove hydroxyl under the catalysis of sodium borohydride to generate 4-n-propyl-2(5H)-furanone; and in the presence of the ketene reductase, enabling the 4-n-propyl-2(5H)-furanone to have a reduction reaction to generate a target product namely the brivaracetam intermediate. The nucleotide sequence of the ketene reductase is as shown in SEQID NO.1, and the amino acid sequence of the ketene reductase is as shown in SEQID NO.2. According to the preparation method of the brivaracetam intermediate disclosed by the invention, only 3-step reactions are needed, the brivaracetam intermediate canbe prepared, additional chemical resolution is not needed, and the whole technology is environmentally-friendly, low in cost and easy to implement.

The invention provides a brivaracetam isomer detection method. According to the detection method, high performance liquid chromatography is adopted. The operation process of the method includes the following steps of: (1) solution preparation; (2) detection; and (3) chromatogram analysis. According to the brivaracetam isomer detection method of the invention, specific chromatographic conditions are selected, and therefore, brivaracetam and the optical isomer impurities thereof can be separated out and detected simply and quickly, and therefore, the quality of basistatin and the preparations thereof can be controlled. With the method adopted, isomer content can be measured, and the development of a synthesis process can be guided, and the formulation of the quality standards of bulk pharmaceutical chemicals can be facilitated.

The invention provides intermediate compounds for preparing brivaracetam, and a preparation method and an application thereof. The invention also provides an intermediate compound A and an intermediate compound B and preparation methods thereof, and a synthetic route for preparing the brivaracetam by adopting the intermediate compound B. According to a technical scheme of the invention, the brivaracetam with high quality and high optical purity and intermediates thereof can be obtained; the ratio of the brivaracetam in four optical isomers is more than 99.5%; a silica gel column is not neededto be used for separation and purification; expensive chiral high-performance liquid chromatography is not needed to be used for resolution; complicated separation and purification steps are avoided;the waste of raw materials is avoided; the cost of production is reduced; and the preparation methods provided by the invention are more applicable to industrial production.

The invention discloses a preparing method for a caproic acid derivative and provides a preparing method for a caproic acid derivative IV. The method comprises the following steps that in a polar nonprotic organic solvent, a compound III and an iodization reagent are subjected to a nucleophilic substitution reaction under inert gas shielding, and the caproic acid derivative IV is obtained. Brivaracetam can be prepared from the caproic acid derivative IV only through two steps, the synthetic route is short, the reaction condition is mild, posttreatment is simple, the reaction yield is high, and the production cost is low. Racemization does not happen in the reaction process, further purification is conducted through crystallization instead of a chiral high-pressure liquid phase preparing column, the chiral purity of the brivaracetam I can be improved till the de value is larger than 99.80%, meanwhile, the content of other single impurities of the brivaracetam I is smaller than 0.1%, the API level is reached, and the method is suitable for industrial production. The expression is shown in the description.

The present invention provides a scalable synthesis of enantiomerically pure brivaracetam, and related derivatives.

The invention discloses a novel brivaracetam intermediate as well as a synthesis method thereof and application. A structural form of the intermediate is shown in the description. A reaction route forsynthesizing brivaracetam from the intermediate is shown in the description. The novel brivaracetam intermediate disclosed by the invention is used for synthesizing brivaracetam, and has the following beneficial effects: raw materials are cheap and easily available, the reaction route is short, the yield is high, and brivaracetam with high optical purity can be obtained without chiral resolutionor column chromatography separation. According to the brivaracetam synthesis process, the raw materials are cheap and easily available, the reaction route is short, the yield is high, and brivaracetamwith high optical purity can be obtained without chiral resolution or column chromatography separation.