218 results about "Acetamido-CNU" patented technology

The invention discloses a synthesis method of a pharmaceutical intermediate of tertiary butyl-(2-(biphenyl-4-yl)-1-(methylol) ethyl) carbamate, which comprises the steps that: diethyl acetamidornalonate and 4-substituent biphenyl are taken as initial raw materials and undergone six steps of reactions including condensation, decarboxylation, hydrolysis, reduction and acylation to obtain the tertiary butyl-(2-(biphenyl-4-yl)-1-(methylol) ethyl) carbamate. The method of the invention has the advantages of available raw materials, convenient operation, high reaction yield rate, recoverable solvents used in the synthesis course, thereby reducing environmental pollution and greatly reducing production cost; according to test results, the products obtained by the method has reliable quality and stable performance.

The invention provides an improved synthesis method of iodixanol and macroporous adsorbent resin chromatography column purification and solvent recrystallization purification processes which are easy to be used for industrialization. In the synthesis method, iodixanol is synthesized by dimerisation of 5-acetamido-N, N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide ('Compound A'), wherein hydroxyacid containing boron or borate and the like are used to form a buffer solution for controlling the pH value of a reaction process, thus side reactions such as excessive alkylation and the like are effectively inhibited and the transformation ratio for transforming into the iodixanol is improved, the crude product containing 85-90% of iodixanol is obtained and then is purified by a macroporous adsorbent resin chromatography column, the total recovery of the iodixanol is 90-95%, the purity of the iodixanol is more than 97%; and the iodixanol is subjected to recrystallization in a solvent containing 2-methoxy ethanol, the recovery of the iodixanol is 90-95%, and the purity of the iodixanol is more than 99%.

The invention discloses a method for producing m-acetamino-N,N-diethyl aniline, which comprises the following steps: (1) mixing m-phenylenediamine, glacial acetic acid and hydrobromic acid to perform an acylation reaction to obtain an acetylated compound; (2) performing ethylation of the acetylated compound and bromoethane, and after the reaction is finished, diluting and filtering the reaction system, and eluting the product filtered out to obtain m-acetamino-N,N-diethyl aniline; (3) concentrating mother solution produced by filtration and elution in the step (2); and (4) dripping sulfuric acid and ethanol into the mother solution to perform an reaction to obtain bromoethane and collecting the bromoethane for use in the ethylation in the step (2). The production method of the invention has the advantages that: the active ingredients in waste water produced in production are fully used; the recycling of the waste water reduces cost; and clean production is realized.

The invention discloses a medicine composition containing aspirin, acetaminophen and caffeine and a preparation method thereof. The medicine composition includes aspirin particles and acetaminophen-caffeine particles, wherein the aspirin particles are prepared by the following compositions by parts of weight: 25 parts of aspirin, 1.8-2.2 parts of microcrystalline cellulose, 0.8-1.2 parts of polyvinylpolypyrrolidone and 0.13-0.15 part of silica; and the acetaminophen-caffeine particles are prepared by the follow compositions by parts of weight: 25 parts of acetaminophen, 6.5 parts of caffeine, 2.3-2.7 parts of microcrystalline cellulose, 0.3-0.7 part of polyvinylpolypyrrolidone and 0.12-0.16 part of silica. The preparation method respectively performs dry palletizing on the aspirin, the acetaminophen and the caffeine and proper accessories, effectively prevents the aspirin from directly contacting with moisture in the air, prevents the acetaminophen from quickening degradation of the aspirin and obviously improves stability of the aspirin contained in the prepared medicine composition.

A novel substituted N-acetyl-L-cysteine (NAC) derivative and methods of using this compound for the treatment of diseases and/or conditions, including but not limited to diseases and/or conditions of, or involving, the Central Nervous System (CNS), including schizophrenia adrenoleukodystrophy, mitochondrial diseases (e.g. Leigh syndrome, Alpers' disease, and MELAS), Huntington's disease, trichotillomania, HIV-associated neurocognitive disorder, hypoxic-ischemic encephalopathy, drug craving, and drug addiction.

The invention belongs to the technical field of medicine, and in particular relates to a process for producing memantine hydrochloride. The process for producing the memantine hydrochloride comprises the steps of performing acetyl amination reaction on 1-bromo-3,5-dimethyladamantane and acetonitrile at 5-10 DEG C under the action of concentrated sulfuric acid to obtain 1-acetamino-3,5-dimethyladamantane; performing hydrolysis reaction on the 1-acetamino-3,5-dimethyladamantane and polyol which does not contain an ether bond under an alkali condition to obtain 1-amino-3,5-dimethyladamantane; and acidifying the 1-amino-3,5-dimethyladamantane with hydrochloric acid, and performing re-crystallization to obtain the high-purity memantine hydrochloride. The process for producing the memantine hydrochloride, disclosed by the invention, has the advantage that the product yield of the memantine hydrochloride is increased by controlling process parameters and changing process conditions based on an existing synthetic process.

Described herein are crystalline forms of (R)-3-(2-(trans-4-(2-aminoethylamino)cyclohexyl)acetamido)-2-hydroxy-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid. In some embodiments, the crystalline forms are formulated for treating a subject in need thereof with a bacterial infection.

3-acetamido-5-acetylfuran as a biomass-based nitrogen-containing platform compound can be used for synthesizing a plurality of important nitrogen-containing fine chemicals. The invention discloses a method for preparing the 3-acetamido-5-acetylfuran by taking chitin monomer N-acetylglucosamine as a raw material. The method is accomplished by the following means: the N-acetylglucosamine is taken asthe raw material, glycine ionic liquid is taken as a catalyst, calcium chloride is taken as a cocatalyst, N, N-dimethylacetamide is taken as a solvent, reaction is carried out for a certain period oftime at a certain temperature, the yield of the obtained product is as high as 52.61%, and in addition, the ionic liquid still shows good catalytic activity after being repeatedly used for eight times. The chitin monomer used in the method is cheap, easy to obtain and renewable, and the application field of chitin biomass is broadened. The ionic liquid used in the reaction is simple in preparation method, cheap and easily available in raw materials, recyclable, green and environment-friendly, and has a good industrial application prospect.

The invention discloses a preparation method of (6S)-2,6-diamino-4,5,6,7-tetrahydrobenzothiazole (formula I). The compound is an intermediate of a drug pramipexole hydrochloride (formula II) for treating Parkinson's diseases. The formula I and formula II are shown in the description. The preparation method comprises the steps of taking 4-acetamino cyclohexanone as an initial raw material; then subjecting 4-acetamino cyclohexanone to bromination and condensation cyclization with N-bromobutanimide and urea in glacial acetic acid; removing acetyl by hydrolysis; and then carrying out alkaline aqueous solution ionization and L-(+)-tartaric acid resolution to obtain a target compound. Compared with an original preparation method, the preparation method provided by the invention omits use of strong oxidizing and corrosive reagents such as potassium dichromate, concentrated sulfuric acid and bromine, changes two reaction steps of sodium hydroxide ionization and chiral resolution into a one-pot method, thereby reducing operation steps and increasing yield.

The invention discloses an aporphine type alkaloid and a preparation method thereof. The compound is 8-acetamido-isocorydine, which is prepared through the nucleophilic substitution reactions between 8-amino-isocorydine, and the chemical structure formula of the compound is represented in the description. Through a Kunming white mouse tumor xenograft model, the results show that the provided alkaloid has a strong effect on inhibiting the tumor growth in body and has a good antitumor activity.

The invention discloses a preparation method for 5-acetoacetamidobenzimidazolone. The preparation method comprises the following steps: with water as a solvent, adding 5-aminobenzimidazolone, a sodiumhydrosulfide solution and active carbon into the water, carrying out mixing, carrying out a reaction at a certain temperature for a certain period of time, and carrying out filtering so as to obtainan intermediate filtrate; and dropwise adding diketene into the intermediate filtrate at a certain temperature, keeping the temperature for a certain period of time, and carrying out cooling, filtering and drying so as to obtain the 5-acetoacetamidobenzimidazolone. According to the invention, by adoption of the sodium hydrosulfide solution, dissolution of the 5-aminobenzimidazolone can be accelerated, and oxidation of the 5-aminobenzimidazolone can be prevented; H2S gas generated by hydrolyzing of the sodium hydrosulfide at a high temperature can generate the sodium hydrosulfide solution afterbeing absorbed by the sodium hydroxide solution, so the H2S can be recycled, and emission of waste gas is avoided; the water is used as the solvent, so the cost of alcohol used as the solvent is reduced, the potential safety hazard during product drying is avoided, and the reaction time is short. The preparation method provided by the invention has the following advantages: a product purity is larger than or equal to 99.2%; the yield of the product is larger than or equal to 85%; the quality is guaranteed; and the yield is improved.

The invention discloses a detection reagent for N-acetyl-beta-D-glucosaminidase with high analytical sensitivity. The reagent disclosed by the invention comprises a reagent R1 and a reagent R2; the reagent takes an artificially-synthesized product 5-(4-(3-methyl-styrene)-rhodanine-3-rhodanine-acetic acid amino-N-acetamino-beta-D-glucoside as a reaction substrate, so that the sensitivity of the reagent is improved; the reagent adopts two kinds of buffer solutions, i.e., an MES (2-(N-morpholine)ethyl sulfonic acid) buffer solution and an AMP (2-amino-2-methyl-1-propanol) buffer solution, so that the catalytic action of an NAG enzyme can be promoted while buffer capacity is guaranteed, a strongly-alkaline environment is effectively improved, and the efficiency of color development is guaranteed; ingredients are reasonably matched and used, so that the overall sensitivity, specificity and accuracy of the reagent are relatively high, and the further popularized use in market is facilitated.