Preparation methods of tofacitinib intermediate amine and dihydrochloride thereof

A technology of tofacitinib and body amine, which is applied in the field of preparation of tofacitinib intermediate amine and its dihydrochloride, can solve the problem of low reaction selectivity, and achieves easy industrialization, easy purification and low cost. Effect

Active Publication Date: 2020-10-30
湖南华纳大药厂手性药物有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0020] Further, the technical problem to be solved in the present invention is to overcome the defect that the reaction selectivity of the prior art is not high, and provide a kind of tofacitinib intermediate amine and its bishydrochloride with higher selectivity and easier industrialization. Preparation

Method used

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  • Preparation methods of tofacitinib intermediate amine and dihydrochloride thereof
  • Preparation methods of tofacitinib intermediate amine and dihydrochloride thereof
  • Preparation methods of tofacitinib intermediate amine and dihydrochloride thereof

Examples

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Effect test

Embodiment 1

[0068] Synthesis of 2-cyano-3-methyl-2-ene-glutarimide (compound III): Take 116.0 g (1.0 mol) of methyl acetoacetate and 84.0 g (1.0 mol) of cyanoacetamide, mix , add dropwise methanol solution of sodium methoxide at 20°C under temperature control [methanol solution of sodium methoxide, obtained by dissolving 65.0g (1.2mol) of sodium methoxide in 300mL of methanol], after the addition is complete, gradually raise the temperature to 40-50°C for reaction After 4 hours, the reaction was completed, cooled to 20°C, added dropwise 10% hydrochloric acid aqueous solution to bring the pH value to 3-4, recovered methanol under reduced pressure, cooled to below 10°C to crystallize, filtered, and air-dried to obtain 145.2 g of a yellow solid , dissolved in an aqueous ethanol solution with an ethanol volume concentration of 80% at 70-75 ° C, added activated carbon for decolorization, filtered, cooled and crystallized, and dried under reduced pressure at 50 ° C to obtain 118.5 g of white sol...

Embodiment 2

[0070] Synthesis of 2-cyano-3-methylglutarimide (compound IV): Weigh cyano-3-methyl-2-ene-glutarimide (compound III) 100.0g, use ethanol volume Dissolve 500mL of ethanol aqueous solution with a concentration of 95%, add 6.0g of palladium carbon with a palladium mass content of 5%, put it into a hydrogenation kettle, replace the air completely with nitrogen, and replace it with hydrogen again, press in hydrogen to 0.1Mpa, and control the temperature Hydrogenate at 20-30°C. After 2 hours of reaction, raise the hydrogen pressure to 0.5 MPa and continue the reaction for 1 hour. After the reaction is complete by sampling HPLC, filter to remove palladium carbon, concentrate the filtrate under reduced pressure, add 300 mL of n-heptane to the residue, and stir Crystallize, filter, and dry under reduced pressure at 50°C to obtain 96.8 g of white solid compound IV with a molar yield of 96%.

Embodiment 3

[0072] Synthesis of 3-amido-3-methylglutarimide (compound V): Prepare 300 mL of sulfuric acid with a mass concentration of 85% with concentrated sulfuric acid and purified water, and add 2-cyano group to the sulfuric acid solution in batches under stirring. -3-Methylglutarimide (compound IV) 76.0g (0.5mol), make the amount of the substance of sulfuric acid solute in the sulfuric acid solution be 1.3 times of the amount of substance of compound IV, complete feeding, be warming up to 65~70 Stir at ℃ for 2 hours, the reaction is completed, the reaction solution is cooled to below 40 ℃, the reaction solution is poured into 1000g of crushed ice, the solid is precipitated, filtered, the filter cake is washed with purified water, and blown and dried at 60 ℃ to obtain 76.3g of the compound V, molar yield 89.9%. After the detection purity is greater than 96%, it is directly put into the next step reaction.

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Abstract

The invention discloses preparation methods of tofacitinib intermediate amine and dihydrochloride thereof. According to the preparation method of the tofacitinib intermediate amine, methyl acetoacetate and cyanoacetamide are taken as starting materials and subjected to condensation, olefinic bond reduction, cyano hydrolysis into amide, N benzylation and Hofmann degradation to prepare primary amine, monomethylation and chiral resolution of the primary amine are performed, and a carbonyl group is reduced with zinc borohydride, so a target product is obtained. The obtained (3R,4R)-1-benzyl-3-methylamino-4-methylpiperidine is subjected to salifying with hydrochloric acid to obtain the dihydrochloride. The methods have the advantages that the whole process avoids a high-pressure hydrogenation reaction under an acidic condition; all the reaction steps adopt conventional reaction reagents and solvents, so raw material sources are not limited, and cost is low; and the method avoids a lithium aluminum hydride reduction reagent with high risk, each step has high selectivity, the reaction product of each step can be easily refined, and the method has advantages in industrialization.

Description

technical field [0001] The present invention relates to a preparation method of tofacitinib intermediate amine and its double hydrochloride, in particular to (3R, 4R)-1-benzyl-3-methylamino-4-methylpiperidine and its double salt Method for the preparation of acid salts. Background technique [0002] JAK / STAT is an important cytokine signaling pathway, which is related to blood system diseases, tumors, rheumatoid arthritis and so on. JAK-3 inhibitors are developed as new drugs for rheumatoid arthritis. Compared with traditional therapeutic drugs and biological antirheumatic drugs, they have the advantages of improving the condition, good safety, and convenient oral administration. The treatment of JAK inhibitors provides a new treatment strategy, so JAK inhibitors have the same therapeutic status as biological agents in foreign authoritative guidelines. [0003] Tofacitinib (CP-690550) is a new oral JAK pathway inhibitor developed by Pfizer, which is a first-in-class drug. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/56
CPCC07D211/56
Inventor 皮士卿李乐欢胡中石傅裕何宏宇徐宏
Owner 湖南华纳大药厂手性药物有限公司
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