[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF APREPITANT<br/>[FR] PROCÉDÉ PERFECTIONNÉ POUR LA PRÉPARATION D'APRÉPITANT
申请人:PIRAMAL ENTPR LTD
公开号:WO2013124823A1
公开(公告)日:2013-08-29
The present invention provides a process for the preparation of 5-[[(2R,3S)-2-[(1R)-1-[3,5- bis(trifluoromethyl)phenyl]ethoxy]-3-(4-fluorophenyl)-4-morpholinyl]methyl]-1,2-dihydro- 3H-1,2,4-triazol-3-one (Aprepitant) comprising condensation of 2-(R)-[(1R)-1-[3,5- bis(trifluoromethyl)phenyl]ethoxy]-3-(S)-(4-fluorophenyl)morpholine hydrochloride salt with 2-(2-chloro-1-iminoethyl)hydrazinecarboxylic acid methyl ester to obtain the reaction mixture containing 2-[2-[(2R,3S)-2-[(1R)-1-[3,5-bis(trifluoromethyl)phenyl]ethoxy]-3-(4- fluorophenyl)-4-morpholinyl]-1-iminoethyl]hydrazinecarboxylic acid methyl ester, which is in-situ cyclized in the presence of dimethylsulfoxide and a polar protic solvent at a low temperature to yield aprepitant having purity ≥ 99.5%.
本发明提供了一种制备Aprepitant(5-[[(2R,3S)-2-[(1R)-1-[3,5-双(三氟甲基)苯基]乙氧基]-3-(4-氟苯基)-4-吗啡啉基]甲基]-1,2-二氢-3H-1,2,4-三唑-3-酮)的方法,包括将2-(R)-[(1R)-1-[3,5-双(三氟甲基)苯基]乙氧基]-3-(S)-(4-氟苯基)吗啡啶盐酸盐与2-(2-氯-1-亚氨基乙基)肼羧酸甲酯缩合,得到反应混合物,其中包含2-[2-[(2R,3S)-2-[(1R)-1-[3,5-双(三氟甲基)苯基]乙氧基]-3-(4-氟苯基)-4-吗啡啉基]-1-亚氨基乙基]肼羧酸甲酯,在二甲基亚砜和极性质子溶剂存在下,在低温下原位环化,得到纯度≥99.5%的Aprepitant。