A method is provided for the preparation of derivative of 3-benzylthio-2-alkylpropionic acid of formula (I): ##STR1## wherein X is independently selected from hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxyl, and R is independently selected from hydrogen or C.sub.1 -C.sub.10 alkyl. An alkyl acrylic acid of formula (III): ##STR2## wherein R is as defined above, is reacted with a substituted .alpha.-toluenethiol of formula (II): ##STR3## wherein X and R are as defined above, at a stoichiometric mole ratio and in the presence of quaternary ammonium salts or quaternary phosphonium salts serving as phase transfer catalysts at a temperature ranging from 100.degree.-150.degree. C. Derivatives of 3-benzylthio-2-alkylpropionic acid are obtained in high yield and high purity.
提供了一种制备3-苄基
硫基-2-烷基
丙酸衍
生物的方法,其
化学式为(I):##STR1##其中X独立选择氢,C.sub.1-C.sub.6烷基或C.sub.1-C.sub.6烷氧基,R独立选择氢或C.sub.1-C.sub.10烷基。将
化学式(III)的烷基
丙烯酸:##STR2##其中R如上定义,与
化学式(II)的取代α-甲
苯硫醇反应:##STR3##其中X和R如上定义,在季
铵盐或季膦盐存在下作为相转移催化剂,在温度范围100℃-150℃反应。得到高收率和高纯度的3-苄基
硫基-2-烷基
丙酸衍
生物。