申请人:Nissan Chemical Industries, Ltd.
公开号:US04577025A1
公开(公告)日:1986-03-18
A method for the preparation of an ester of .alpha.-thio-.alpha.-aromatic propionic acid derivatives of the formula: ##STR1## wherein R.sup.1 is alkyl, phenyl or benzothiazolyl, R.sup.2 is alkyl and Ar is an aromatic substituent. The method comprises reacting an ester of .alpha.-chloro-.alpha.-thiopropionic acid of the formula: ##STR2## with an aromatic compound of the formula ARH, in the presence of a Lewis acid. The method provides good reactivity and positional selectivity in the Friedel-Crafts reaction. Many esters of the formula (2) are useful as pharmaceuticals, agricultural chemicals, perfumes or their intermediates.
一种制备α-硫基-α-芳基丙酸酯衍生物的方法,其化学式为:其中R.sup.1是烷基、苯基或苯并噻唑基,R.sup.2是烷基,Ar是芳基取代基。该方法包括将α-氯-α-硫代丙酸酯的化学式:与芳香化合物ARH在Lewis酸存在下反应。该方法在Friedel-Crafts反应中提供了良好的反应性和位置选择性。化学式(2)的许多酯可用作药物、农药、香料或它们的中间体。