Process for the preparation of
1-[3-mercapto-(2S)-methylpropionyl]-pyrrolidine-(2S)-carboxylic acid
    1.
    发明授权
    Process for the preparation of 1-[3-mercapto-(2S)-methylpropionyl]-pyrrolidine-(2S)-carboxylic acid 失效
    制备1- [3-巯基 - (2S) - 甲基丙酰基] - 吡咯烷 - (2S) - 羧酸的方法

    公开(公告)号:US4332725A

    公开(公告)日:1982-06-01

    申请号:US218814

    申请日:1980-12-22

    摘要: The invention relates to a novel process for the preparation of 1-[3-mercapto-(2S)-methylpropionyl]-pyrrolidine-(2S)-carboxylic acid through the N-acylation of L-proline.According to the process of the invention L-proline is acylated with a 3-halogen-2-methylpropionyl chloride of the formula III ##STR1## wherein Hal is a halogen atom, preferably chlorine or bromine, the obtained 1-[3-halogen-(2S)-methylpropionyl]-pyrrolidine-(2S)-carboxylic acid, wherein Hal is as stated above, is reacted with an alkali thiosulfate or alkali trithiocarbonate and the reaction product is hydrolized with an acid.The process of the invention is very economical as compared with the known processes. The desired product is prepared from methacrylic acid in 4 reaction steps with a total yield of 25 percent and from L-proline in 2 reaction steps with a total yield of 30 percent.

    摘要翻译: 本发明涉及通过L-脯氨酸的N-酰化制备1- [3-巯基 - (2S) - 甲基丙酰基] - 吡咯烷 - (2S) - 羧酸的新方法。 根据本发明的方法,L-脯氨酸用式III III的3-卤素-2-甲基丙酰氯酰化,其中Hal是卤素原子,优选氯或溴,得到的1- [3-卤素 - (2S) - 甲基丙酰基] - 吡咯烷 - (2S) - 羧酸(其中Hal如上所述)与碱金属硫代硫酸盐或碱式三硫代碳酸酯反应,反应产物用酸水解。 与已知方法相比,本发明的方法是非常经济的。 所需产物由甲基丙烯酸在4个反应步骤中制备,总产率为25%,在2个反应步骤中由L-脯氨酸制备,总产率为30%。