83 results about "Racetam" patented technology

The invention relates to new use of levo-oxiracetam in pharmaceutical field, and in particular relates to application of levo-oxiracetam in preparation of a medicine for treating memory and intelligence disturbance. The experiment result shows that the levo-oxiracetam is a main active ingredient for playing efficacy in oxiracetam, the clinical dosage can be greatly reduced by singly using the levo-oxiracetam, and the potential toxic and side effect is reduced. According to the invention, the levo-oxiracetam is a single active ingredient, the raw material purity is greater than 99.5% so as to effectively avoid the toxicity risk caused by other impurities in the medicine, the pharmacy is safer, the medicine quality is more controllable, and the curative effect is more precise.

The invention relates to a freeze-dried powder injection of L-oxiracetam and a process for preparing the freeze-dried powder injection. The freeze-dried powder injection comprises, by weight, 1 part of the L-oxiracetam, 0.1 to 10 parts of an excipient, 0.01 to 1 part of an antisticking agent and 0.01 to 0.5 part of a pH regulator, wherein polyethylene glycol (PEG) series of products serve as the antisticking agent preferably. The freeze-dried powder injection which is prepared on the basis of a prescription according to the process has the advantages of being short in freeze-drying time, attractive in appearance, short in redissolving time and high in stability.

An oxiracetam injection is prepared from oxiracetam, gluclose (or sodium chloride) for injection and water for injection through proportioning, dissolving the glucose or sodium chloride for injection in the water for injection, adding activated carbon, heating, holding the temp. filtering, adding oxiracetam to the filtrate, stirring for dissolving, adding the water for injection, regulating pH value, fine filtering, bottling and sterilizing at 105-126.5 deg.C.

The invention belongs to the technical field of medicine, and particularly relates to an oxiracetam compound. The oxiracetam compound provided by the invention contains semi-crystalline water. The oxiracetam compound has the advantages that related substances are small, the purity is high, the stability is good, and a moisture-absorption and weight-gaining effect is not obvious even if under a high humidity condition.

The invention relates to an oxiracetam compound and a new method thereof. In the method, 3-chloro-2-hydroxy propionitrile is used as an initial raw material. The method comprises the following steps of: synthesizing 4-hydroxyl-2-pyrrolidone through 4-chloro-3-hydroxyl-butylamide; and then synthesizing oxiracetam. The invention overcomes the defects of complicated preparation process, trouble steps, high cost, low product purity and difficult purification of the prior art.

The present invention provides an oxiracetam drug activity composition, which comprises the following components: a component I, a component II and a component III, wherein the component I is oxiracetam, the component I content is more than or equal to 98.0%, the component II is glycine anhydride, the component II content is more than 0 and is less than or equal to 0.3%, the component III is one or a plurality materials selected from 4-hydroxy-2-oxo-1-pyrrolidineacetic acid, 4-hydroxy-2-oxo-1-pyrrolidine, ethyl 4-hydroxy-2-oxopyrrolidine-1-acetate, methyl 4-hydroxy-2-oxopyrrolidine-1-acetate, and piracetam, the component III content is more than 0 and is less than or equal to 1.5%, the 4-hydroxy-2-oxo-1-pyrrolidineacetic acid content is more than 0 and is less than or equal to 0.5%, and the total content of the component II and the component III is less than or equal to 1.5%. The drug activity composition of the present invention has stable quality, and can completely meet quality requirements on the drug activity composition by oxiracetam preparations. In addition, the prepared preparation has characteristics of safety, effectiveness, and controllable quality, and clinical therapy effects and medication safety of the oxiracetam preparation are ensured.

The invention belongs to the field of chemical synthetic techniques, in particular relates to a novel piracetam synthetic method. The method comprises the following steps of: mixing ethyl-4-chloro-n-butanoate, glycinamide hydrochloride, alkaline and an alcohol organic solvent, and heating and reflowing for 20 to 30 hours, and thermally filtering, evaporating to remove the solvent under the reduced pressure, and then recrystallizing, filtering and drying the residues to obtain white or almost white crystal which is piracetam, wherein the mole ratio of ethyl-4-chloro-n-butanoate to glycinamide hydrochloride to alkaline is 1: (1.1-1.8): (1.0-2.0). The method is simple and short in reaction step, and mild in reaction condition, is convenient to operate for production; and moreover, the method is environment-friendly, and the synthetic raw materials and solvents are cheap and easy to obtain, thus the method is suitable for industrial production.

The invention discloses Sphingobacterium (sp.) SIT102 with the preservation number of CGMCC NO.6158 and a method for performing enantioselective hydrolysis to generate levetiracetam acid by utilizing the Sphingobacterium SIT102 serving as biocatalyst to catalyze racemization etiracetam acid esters. The method for preparing the levetiracetam acid comprises the steps of placing Sphingobacterium SIT102 cells into buffered solution, adding the racemization etiracetam acid esters into the buffered solution, performing the enantioselective hydrolysis through catalysis to obtain the levetiracetam acid. According to the method for preparing the levetiracetam acid by utilizing the Sphingobacterium SIT102 serving as the biocatalyst, the used biocatalyst is easy to prepare, the reaction condition is moderate, the yield of the levetiracetam acid can reach 48%, the enantiomer excess reaches 96%, and the production cost is low. Therefore, the method for preparing the levetiracetam acid by utilizing the Sphingobacterium has considerable industrial application development prospects.

The invention relates to a method for large-scale preparation of pramiracetam. The method comprises the following steps of: carrying out a condensation reaction, dissolving and filtering, re-dissolving and extracting, refluxing, freezing and suction-filtering. The method provided by the invention has simple process operation, is safe and pollution-free. Moreover, the prepared pramiracetam has high yield, high purity, easily obtained materials, and low production cost, and is suitable for large-scale production of the enterprises.

The invention provides a method for preparing oxiracetam, which comprises the steps of: reacting 2-(4-tertiary butyl disilyloxy-2-oxo pyrrolidine-1-yl) ethyl acetate or 2-(4-tertiary butyl diphenylsilyl-2-oxo pyrrolidine-1-yl) ethyl acetate as raw materials with low-molecular-weight halogenated acetic acid ester in a non-protonated solvent under basic condition, and respectively removing protecting groups to prepare oxiracetam. By adopting the method, the problems of the prior art that reaction conditions are rigor, byproducts are many, and the product purity and yield are low in the oxiracetam synthesis process are solved. The method is simple to operate, low in equipment requirements, and high in product purity and yield, and is particularly suitable for industrial production.

The invention provides a piracetam tablet composition with high drug loading capacity and a preparation method thereof. The piracetam tablet composition comprises 80-90% of piracetam, 10-20% of high-formability microcrystalline cellulose (CEOLUSTM), 2-5% of a disintegrating agent, 0.5-2% of a lubricant and 0-4% of a gastric-soluble film coating premix. The composition can effectively improve the drug loading capacity of a piracetam tablet and improve the problem of poor friability of a product due to improvement of the drug loading capacity. In addition, the invention also provides a preparation method for the piracetam tablet with the high drug loading capacity. The method provided by the invention is simple and convenient in process operation, high in production efficiency and applicableto industrial production.

The invention relates to an oxiracetam injection composition and a preparation method thereof. The oxiracetam injection provided by the invention comprises 0.1-0.3 g of oxiracetam, 0.2-0.4 mg of sodium dihydrogen phosphate, 0.02-0.04 mg of sodium calcium edetate, 0.02-0.04 mg of glycine, 0.02-0.04 mg of vitamin B6, a pH value regulator (for regulating the pH value to the range from 4.5 to 5.0) and water for injection per 1 ml. The oxiracetam injection provided by the invention has the advantages of good quality and high stability.

The present invention relates to medicinal chemistry field, be specifically related to a kind of preparation method of aniracetam, and its synthetic route is as follows:

The invention discloses a pramiracetam hydrate crystal and a preparation method thereof, and belongs to the field of medicines. The preparation method of the pramiracetam hydrate crystal comprises thefollowing steps: providing a pramiracetam solution in which a solvent is an organic reagent; dropwise adding water into the solution, cooling the solution to crystallize, and filtering the liquid; leaching the crystal by using an organic reagent and carrying out suction filtration at the same time; and drying the filter cake under a vacuum condition until the water content is 5-7% to obtain a monohydrate crystal. According to the preparation method, relatively high crystal yield and purity can be obtained.

The invention belongs to the technical field of medicines, and particularly relates to a preparation method of a piracetam freeze-dried powder injection for injection. The preparation method of the piracetam freeze-dried powder injection for injection comprises the following steps: (1) putting 60% of water for injection based on the total volume into a mixing tank, adding piracetam in a stirring state, fully dissolving, adding the rest volume of water for injection, stirring, regulating the pH value, adding activated carbon for injection, stirring, filtering, decarbonizing, and continuously stirring, finely filtering, filling into a penicillin bottle, and performing semi-corking; S2) performing pre-freezing on the penicillin bottle in the step S1, starting a condenser, starting a vacuum pump when the temperature of the condenser is reduced to -40 DEG C or below, increasing the temperature to -18 DEG C, and keeping the temperature until the water line disappears; continuously raising the temperature to 35 DEG C, keeping the temperature, pumping out air, filling high-purity nitrogen, and pressing a penicillin bottle plug; and S3) rolling an aluminum-plastic cover, carrying out lightinspection, and packaging to obtain the injection. The piracetam freeze-dried powder injection for injection disclosed by the invention has the advantages that the appearance conforms to the specification, the redissolution is easy, the impurities are few, and the quality is stable.

A high-energy composite medicine for treating acute or chronic cerebrovascular disease, cerebral trauma, toxipathic cerebrosis, hypomneis and cerebral disfunction contains proportionally inosine, ATP, VC and piracetam.

The invention provides an oxiracetam enteric-coated capsule. Oxiracetam in special crystallization form is used as an active component. A composite carrier containing polyoxyethylene PEO and hydroxypropyl methyl cellulose ( or polyvinylpyrrolidone) in the mass ratio of the polyoxyethylene PEO to the hydroxypropyl methyl cellulose being (1-3) to 1, is carefully selected, and the prepared oxiracetamenteric-coated preparation can reduce the dissolution rate of the active component in the stomach, and also has favorable slow control slow release properties and storage stability. The prepared oxiracetam enteric-coated granules are subjected to long-term stability test under the condition that the temperature is 25 DEG C+/-2 DEG C, and the relative humidity is 60%+/-10%, and after long-term experiment for 24 months, sample properties, content and related substances all conform to specification. The oxiracetam enteric-coated capsule is good in stability, and long in quality guarantee period.The preparation method is simple, and suitable for industrial production.

The invention belongs to the field of drug synthesis, and particularly relates to a preparation method of oxiracetam isomer. (S)-oxiracetam and (R)-oxiracetam are prepared by the following steps: 1) dehydrating in an oxiracetam acid molecule to generate oxiracetam lactone; 2) enabling lactone to react with D(+)-10-camphorsulfonic acid to generate (1R, 5R), (1S, 5R), (1R, 5S) and (1S, 5S) types ofoxiracetam acid lactone salt; 3) enabling (1R, 5R) and (1S, 5R) types of oxiracetam acid lactone salt to react with ammonia to geneate (R)-oxiracetam, and enabling (1R, 5S) and (1S, 5S) types of oxiracetam acid lactone salt to react with ammonia water to generate (S)-oxiracetam. The method provided by the invention can be used for preparing (S)-oxiracetam and (R)-oxiracetam. The method provided bythe invention can be used for preparing (S)-oxiracetam and (R)-oxiracetam, does not waste materials, has the advantages of simple operation, high product yield (up to 60%) and high product purity (99.8% or higher), and is suitable for industrialized large-scale production.

The invention discloses 2-(4- OBzl-2-oxo-2,5-pyrroline-1-yl)-acetamide and synthesis and application thereof. The structure of 2-(4- OBzl-2-oxo-2,5-pyrroline-1-yl)-acetamide is indicated as the formula (3), and the synthesis route is indicated as follows. 2-(4- OBzl-2-oxo-2,5-pyrroline-1-yl)-acetamide can serve as an intermediate to be used for synthesis of oxiracetam, has the advantages that synthesis steps are short, operation is simple and convenient, raw materials are cheap and easy to obtain and emission of three wastes is little, and enjoys broad industrial application prospects.

The invention provides a novel synthesis process for preparing an oxiracetam key intermediate 2-(2,4-dioxopyrrolidine-1-yl)-acetamide by using 4-halogenated acetoacetic ester and glycinamide hydrochloride as raw materials by virtue of a 'one-pot method'. The novel synthesis process has the advantages of being few in reaction steps, high in yield, cheap and easily available in raw materials, simple in post-treatment, has few waste gas, waste water and waste residues and the like.

The invention belongs to the technical field of medicine, and specifically relates to an oxiracetam compound and a preparation method thereof. The provided oxiracetam compound contains a half of crystal water, and has the advantages of high purity, good stability, and excellent technology repeatability. The invention also relates to an application of oxiracetam in preparation of drugs for treating brain damages caused by physical and chemical factors, various cerebral anoxia, and chronic cerebral insufficiency.

The invention relates to the field of preparation of compounds, in particular to an industrial preparation method of pramiracetam sulfate. The method includes: (1) converting N-(2-(diisopropyl)ethyl)-2-chloroacetamide hydrochloride to obtain free amide, and removing moisture in the free amide; (2) reacting solid alkali with alpha-pyrrolidone in a solvent I under the protection of nitrogen, simultaneously distilling alcohol generated by the reaction, then adding a solution prepared from the free amide and the solvent I dropwise, and carrying out reaction to obtain pramiracetam; and (3) preparing pramiracetam and sulfuric acid into pramiracetam sulfate. According to the method, pramiracetam sulfate with excellent quality can be efficiently obtained, and the method has the characteristics oflow cost, high environmental friendliness, no use of dangerous materials, and high process safety, and is beneficial to popularization and application in industrial preparation.

The invention provides an oxiracetam lipid micro-bubble. The oxiracetam lipid micro-bubble comprises a phospholipid bi-layer membrane, a gas and an oxiracetam-supported alhumin nanoparticle, wherein the gas and the oxiracetam-supported alhumin nanoparticle are wrapped in the phospholipid bi-layer membrane, and the gas is a nitrogen and perfluoropropane mixed gas with the volume ratio of 1:2-5. The oxiracetam lipid micro-bubble has high drug loading capacity and entrapment rate, can improve the plasma concentration of a target position, prolongs the action time of drugs in the target position, reduces drug degradation and improves the drug stability, and the nanoparticle can promote selective distribution of the drugs, facilitation of delivery of the drugs to lesion tissues, increases the drug effects and reduces toxic and side effects. The invention also discloses a preparation method of the lipid micro-bubble. The preparation method has the advantages of simplicity, easy industrialization, no involving of chemical reactions in the preparation process, no use of highly toxic organic solvents, high safety and strong environmental protection property.