申请人:Lonza Ltd.
公开号:US04876350A1
公开(公告)日:1989-10-24
Process for the production of (+) biotin. A compound of the formula: ##STR1## wherein R.sub.1 is e.g., an (R)-1-phenylalkyl group, and R.sub.2 is, e.g., hydrogen. The desired diastereomer of the formula: ##STR2## is separated out. If R.sub.2 is H, a protective group is introduced by reaction with, e.g., an aliphatic acid chloride. The diastereomer is converted by reaction with a thiocarboxylic acid salt derivative into the corresponding thiolacetone, which is reacted with a Grignard reactant and subsequently water is split off. Alternatively, the corresponding thiolacetone is reacted with a compound of the formula: (C.sub.6 H.sub.5).sub.3 P.sup..sym. (CH.sub.2).sub.4 COOR.sub.3.X.sup..crclbar. wherein R.sub.3 is, e.g., H, and X is a halogen atom, in the presence of a base to provide a compound of the formula: ##STR3## Such compound is catalytically hydrogenated and then converted into (+) biotin by cleavage of the protective groups.
制备 (+) 生物素的过程。一个化合物的式子如下:##STR1## 其中R.sub.1是例如(R)-1-苯基烷基,R.sub.2是例如氢。所需的对映异构体的式子如下:##STR2## 被分离出来。如果R.sub.2是H,则通过与例如脂肪酸氯化物的反应引入保护基。通过与硫代羧酸盐衍生物的反应将对映异构体转化为相应的硫代丙酮,然后与格氏试剂反应,随后水被分离出来。或者,将相应的硫代丙酮与式子为(C.sub.6 H.sub.5).sub.3 P.sup..sym. (CH.sub.2).sub.4 COOR.sub.3.X.sup..crclbar. 的化合物在碱的存在下反应,其中R.sub.3为例如H,X为卤素原子,以提供化合物的式子如下:##STR3## 这种化合物经过催化氢化,然后通过裂解保护基转化为(+)生物素。