34 results about "Glutamic acid diethyl ester" patented technology

The invention relates to a new synthesis technology of anti-cancer drug Raltitrexed. The technology comprises the following steps: 1) using L-glutamic acid as raw material to perform esterification with alcohol under the action of halogenating agent and obtain L-glutamic acid diester hydrochloride; 2) using 2-amino-5-methyl-benzoic acid as raw material to prepare 6-bromomethyl-3,4-dihydro-2-methyl-4-oxo-6-quinazoline through cyclization, amination and bromination; 3) using 2-thienyl-propanedioic acid as raw material to prepare N-[5-[N-(tert-butoxycarbonyl)-N-methylamino]-2-thenoyl]-L-glutamic acid diethyl ester through nitrification, esterification, reduction, amino protection, N-methylation and device-esterification; 4) using L-glutamic acid diester hydrochloride and N-[5-[N-(tert-butoxycarbonyl)-N-methylamino]-2-thenoyl]-L-glutamic acid diethyl ester to prepare N-[5-(N-methylamino)-2-thenoyl]-L-glutamic acid diester through dehydrant condensation and deamination protection; and 5) using N-[5-(N-methylamino)-2-thenoyl]-L-glutamic acid diester and 6-bromomethyl-3,4-dihydro-2-methyl-4-oxo-6-quinazoline to perform condensation under the catalysis of alkali, recycling preparative chromatography, purifying, and performing de-esterification to obtain Raltitrexed.

The synthesis of anticancer medicine Raltitrexed with 2, 5-thienyl diformic acid and diethyl glutamate as initial material and through six reaction steps of monocondensation, rearrangement, N-methylation, e;limination of tert-butoxy carbonyl group, condensation with 6-bromomethyl-2-methyl-4-quinbolone and saponification. The present invention has total yield of 18.1%, higher than that of available synthesis line, less reaction steps, mild condition and simple operation, and is suitable for mass production.

The invention relates to an intermediate of pemetrexed disodium, a preparation method thereof and a method for preparing pemetrexed disodium thereby; and the intermediate is (2-(4-(3-(2,4-diamino-6-oxy-1,6-dihydro-pyridine-5-group)-3-(1,3)dioxolane-2-group-propyl) benzylamine)sodium glutaric acid. The synthesis of the intermediate comprises the following steps: firstly, condensation reaction is conducted on 4-bromobenzoic acid or 4-iodobenzoic acid and L-glutamate diethylester, then Hack reaction is conducted, 4-bromo is replaced and 4-butyraldehyde is formed, then selective bromo replacement is conducted and the 4-butyladehyde is converted into 2-bromobutyraldehyde, and then condensation reaction of aldehyde and ethylene glycol is utilized for protecting the aldehyde, and pyrimidine ring is further synthesized, and finally the intermediate is obtained. Acid hydrolysis ring-closing reaction and sodium hydroxide salification are respectively conducted for once on the intermediate so as to obtain the pemetrexed disodium. The method for preparing pemetrexed disodium in the invention has high yield, low cost and easy operation and is applicable to industrialized production.

The invention provides a preparation method of pemetrexed disodium, which comprises the steps of performing hydrolysis reaction of 4-[2-(2-amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl] methyl benzoate in sodium hydroxide to generate acid, then condensing with L-glutamic acid diethyl ester to obtain N-[4-[2-(2-amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]-L-glutamic acid diethyl ester toluenesulfonate, obtaining the crude pemetrexed disodium through saponification under the action of sodium hydroxide, and finally crystallizing in a mixed solvent at room temperature to obtain the end product. With the adoption of the technical scheme, the purification and purification of the crude pemetrexed disodium can be directly performed, so that the cost can be effectively lowered. As the steps are carried out at room temperature, the oxidation of the pemetrexed disodium caused by high temperature can be effectively avoided. The purity of the end product is high and meets the national requirement on purity of chemicals.

The invention discloses a preparation method of Raltitrexed. The method comprises steps of: carrying out alkaline hydrolysis on N-[[5-[(1,4- dihydro-2-methyl-4-oxygen-6quinazoline) methyl] formoxyl-]-2-thiophene] formyl]-L-glutamic acid diethyl ester with existence of a certain proportion of alcoholic solvent; filtering out insoluble substances after the reaction; then extracting with an organic solvent; adjusting a pH of a water layer to 6-7 during neutralization to precipitate a small amount of viscous solid and stirring for 1-3 h; After complete solidification of a product, adjusting a pH to 2-3 to precipitate all of the product; dissolving a crude product with an organic solvent; filtering an depriving insoluble substances; adding water and crystallizing to obtain a finished product. The preparation method of the present invention well solves a problem, which commonly exists in a technology, of severe exceeding of standard of residue on ignition, has simple operations, produces high-quality product with high yield and is suitable for industrialized production.

The invention belongs to the technical field of medicine, and particularly disclose a method for preparing a raltitrexed intermediate, i.e., N-(5-methylamino-2-thiophene formyl)-L-glutamate diethyl ester. In the preparation method, N-(5-methylamino-2-thiophene formyl)-L-glutamate diethyl ester is taken as a raw material. The method is characterized by comprising the following steps of: dissolving the raw material into ethyl acetate, adding a condensing agent, reacting while stirring at the temperature of 30-60 DEG C, filtering, and concentrating under reduced pressure to obtain an oily matter; and dissolving the oily matter into absolute ethyl alcohol, adding sodium borohydride in batches, reacting at the temperature of 20-40 DEG C, adding water for stopping the reaction, concentrating under reduced pressure to dryness, adding water and methylene dichloride for laminating, drying an organic phase by using anhydrous magnesium sulfate to obtain a product. The method has milder reaction conditions, is easier to operate under the condition of not lowering the yield, and is more suitable for industrial production; and the problems of toxicity and safety are solved.

The present invention discloses a practical synthesis process of a new anticancer drug pralatrexate. According to the present invention, 10-propargyl-10-methoxycarbonyl-4-deoxy-4-amino-10-deaza pteroic acid methyl ester is adopted as a starting raw material, a saponification reaction is performed to obtain 4-(2-carboxy-1-(2,4-diaminopteridine-6-yl)pent-4-yn-2-yl)benzoic acid, the 4-(2-carboxy-1-(2,4-diaminopteridine-6-yl)pent-4-yn-2-yl)benzoic acid is subjected to decarboxylation to obtain 4-(1-(2,4-diaminopteridine-6-yl)pent-4-yn-2-yl)benzoic acid, the 4-(1-(2,4-diaminopteridine-6-yl)pent-4-yn-2-yl)benzoic acid reacts with L-diethyl glutamate to obtain 10-propargyl-10-deaza aminopterin diethyl ester, and finally a saponification reaction is performed to obtain the target product pralatrexate, wherein the green, high yield and convenient synthesis of the pralatrexate is completed, the final product can achieve the level from several grams to tens of grams, the purity is more than or equal to 90%, and the good industrial application prospects are provided.

The invention relates to an analysis and detection method of L-diethyl glutamate and is used in quality control of the L-diethyl glutamate. Analysis and detection are carried out through HPLC, of which chromatographic conditions are described as follows: a chromatographic column (C18, 4.6*150mm, 5[mu]m) is filled with octadecylsilane chemically bonded silica as a filling material; a mobile phase is a solution system prepared by mixing a buffer salt solution and acetonitrile and regulating a pH value to 7.0 with NaOH; a detection wavelength is 210 nm; and a column temperature is 22-32 DEG C. By means of the analysis and detection method, the L-diethyl glutamate can be effectively separated out from impurities thereof. The method is high in separation degree, is simple in operations, is good in repeatability and durability, and is stable and reliable in results.

The invention discloses a synthesis method for a Raltitrexed midbody. The method comprises the following steps of a, pumping N-(5-amino-2-thenolyl)-L-glutamate diethyl ester and methyl iodide same in mole into a high flux-microchannel reactor from two feeding injection ports; b, placing the reactor in constant temperature water bath at 35-45 DEG C, enabling the reaction solution to react through the high-flux-microchannel reactor at a velocity of 5-13 mL/min, collecting the reaction solution at the outlet, cooling the reaction solution to a room temperature, adding water and ethyl acetate firstly in the reaction solution, and using ethyl acetate to extract the reaction solution twice, and merging organic layers; after performing alkaline hydrolysis on the water layer with anhydrous sodium carbonate, extracting the alkaline hydrolyzed water phase with ethyl acetate, merging the organic layer which is extracted by the reaction solution and the organic layer after the water layer is alkaline hydrolyzed; and drying the organic layers with anhydrous magnesium sulfate, filtering the dried organic layers, decompressing to remove the solvent, and thus obtaining the Raltitrexed midbody. The synthesis method provided by the invention is scientific and rational, the product yield and purity are high, and the method is suitable for promotion and application.

The invention provides a preparation method of N-(5-(N-t-butyloxycarbonyl-N-methylamino)-2-thenoyl)-L-diethyl glutamate. The preparation method is characterized by including dissolving N-(5-(N-t-butyloxycarbonyl amino)-2-thenoyl)-L-diethyl glutamate in organic solvent, adding alkali, then adding methylation reagent for methylation, filtering, concentrating filtrate to obtain a crude product, and purifying a pure product to obtain the N-(5-(N-t-butyloxycarbonyl-N-methylamino)-2-thenoyl)-L-diethyl glutamate. The preparation method is mild in reaction condition, easy to operate, high in yield, high in purity of reaction products and suitable for industrial production.

The invention discloses a compound oil-absorbing material with flame retardant property and a preparation method thereof. The compound oil-absorbing material is prepared by the following steps of: adopting polytetrafluoroethylene, dimethylaminoethyl acrylate, ethylhexyl palmitate, o-hydroxybenzoic acid phenyl ester and acetyl tributyl citrate as main components, adding polyvinylpyrrolidone, epoxidized sunflower oil, diphenyl silanediol, siliceous lime, nano microcrystalline ceramic powder, titanium dioxide, ramie fiber, L-glutamic acid diethyl ester hydrochloride, polyphenyl quinoxaline, hydroxygenkwanin, surface active agent and foaming agent, and adopting processes of grinding, sintering, ultrasonic treatment, polymerization, acid leaching, dry-process treatment, extrusion, foaming and granulation and the like. The compound oil-absorbing material disclosed by the invention is excellent in flame-retardant effect, has excellent oil-absorbing effect and mechanical oil-holding effect for crude oil, has no toxicity, can meet the industrial requirements and has better application prospect.