申请人:Ciba-Geigy Corporation
公开号:US05077439A1
公开(公告)日:1991-12-31
Compounds of formula I ##STR1## wherein R is C.sub.1 -C.sub.4 alkyl or benzyl, are prepared by reacting a butanal of formula II ##STR2## wherein X and Y are each independently of the other chloro, bromo or iodo, in an inert solvent, with a compound of formula III R-S-Me (III) wherein R is as defined above and Me is an alkali metal cation, and converting the resultant compound of formula IV ##STR3## wherein X and R are as defined above, in an inert solvent and in the presence of a base, into a compound of formula I.
公式I的化合物 ##STR1## 其中R为C.sub.1-C.sub.4烷基或苄基,通过将公式II的丁醛与公式III的化合物反应制备而成。公式II为 ##STR2## 其中X和Y各自独立地为氯、溴或碘,反应在惰性溶剂中进行。公式III为R-S-Me (III),其中R如上定义,Me为碱金属阳离子。反应产生的公式IV的化合物 ##STR3## 其中X和R如上定义,在惰性溶剂中,在碱的存在下,转化为公式I的化合物。