OPTICALLY ACTIVE 3,3 -DITHIOBIS(2-AMINO-2-METHYLPROPIONI C ACID) DERIVATIVE AND PROCESS FOR PRODUCING OPTICALLY ACTIVE 2-AMINO-3-MERCAPTO-2-METHYL-PROPIONIC ACID DERIVATIVE
申请人:KANEKA CORPORATION
公开号:EP1666458A1
公开(公告)日:2006-06-07
The present invention provides a useful novel intermediate and a novel synthetic process that can highly prevent contamination by various impurities to an optically active R or S isomer of a 2-amino-3-mercapto-2-methylpropionic acid derivative or salt thereof useful as an intermediate for pharmaceuticals and the like and provides a process for easily and efficiently producing a high purity optically active R or S isomer of a 2-amino-3-mercapto-2-methylpropionic acid derivative or salt thereof on an industrial production scale. A process of producing a high purity 2-amino-3-mercapto-2-methylpropionic acid derivative or salt thereof includes reductively cleaving a sulfur-sulfur bond of an intermediate, which is a high purity optically active 3,3'-dithiobis(2-amino-2-methylpropionic acid) derivative substantially free of impurities. Thus, a resulting optically active 2-amino-3-mercapto-2-methylpropionic acid derivative can be produced without generating impurities as by-products which are difficult to remove.
本发明提供了一种有用的新型中间体和一种新的合成过程,可以高度防止各种杂质对光学活性的2-氨基-3-巯基-2-甲基丙酸衍生物或其盐(作为药物中间体等)的R或S异构体的污染,并提供了一种在工业生产规模上轻松高效地生产高纯度光学活性的2-氨基-3-巯基-2-甲基丙酸衍生物或其盐的过程。生产高纯度的2-氨基-3-巯基-2-甲基丙酸衍生物或其盐的过程包括还原地裂解中间体的硫-硫键,该中间体是高纯度的光学活性3,3'-二硫代(2-氨基-2-甲基丙酸)衍生物,几乎不含杂质。因此,可以生产出不产生难以去除的副产物杂质的光学活性的2-氨基-3-巯基-2-甲基丙酸衍生物。