he invention is concerned with a novel process for the manufacture of novel thiophene derivatives and of biotin, respectively.
The process starts from L or DL-cystine esters and proceeds via various novel intermediates, particularly the optically active compounds of the general formulae
wherein R2 is aryl-lower alkyl, R5 is hydrogen or -COOR4 and R4 is lower alkyl, aryl or aryl-lower alkyl, or the corresponding racemates.
本发明涉及一种分别制造新型
噻吩衍
生物和
生物素的新工艺。
该工艺从 L 或
DL-胱氨酸酯开始,通过各种新型中间体,特别是通式为
其中 R2 为芳基-低级烷基,R5 为氢或-COOR4,R4 为低级烷基、芳基或芳基-低级烷基或相应的外消旋体。