申请人:Shionogi & Co., Ltd.
公开号:US05463052A1
公开(公告)日:1995-10-31
A selective and high-yield method is described for producing stereoisomeric benzylidene derivatives of the formula III: ##STR1## wherein R.sup.1 and R.sup.2 each independently is lower alkyl, lower alkoxy or halogen; Y is SO.sub.2, SO or CO; --A-- is optionally substituted lower alkylene; --B-- is --CH.sub.2 -- or --O--; or --A-- and --B-- taken together may form optionally substituted phenylene or optionally substituted lower alkenylene; and R is hydrogen, optionally substituted lower alkyl, cycloalkyl, lower alkoxy, hydroxy, optionally substituted aryl, optionally substituted arylalkyl; optionally substituted arylalkyloxy, heterocyclic ring or N-protecting groups, which comprises reacting a compound of the formula I: ##STR2## wherein R.sup.1 and R.sup.2 are as defined above and X is lower alkoxy or halogen with a compound of the formula II: ##STR3## wherein Y, --A--, --B-- and R are as defined above in the presence of a base.
本文描述了一种选择性和高产率的方法,用于制备公式III的立体异构苯甲醛衍生物:##STR1## 其中R.sup.1和R.sup.2各自独立地是较低的烷基,较低的烷氧基或卤素; Y为SO.sub.2,SO或CO; --A--是可选的取代较低的烷基; --B--是--CH.sub.2--或--O--; 或--A--和--B--一起可以形成可选的取代苯基或可选的取代较低烯基; 而R是氢,可选择取代的较低烷基,环烷基,较低烷氧基,羟基,可选择取代的芳基,可选择取代的芳基烷基; 可选择取代的芳基烷氧基,杂环环或N-保护基,其包括在碱存在下将公式I的化合物:##STR2## 其中R.sup.1和R.sup.2如上所定义,X为较低的烷氧基或卤素,与公式II的化合物反应:##STR3## 其中Y,--A--,--B--和R如上所定义。