申请人:AMERICAN CYANAMID COMPANY
公开号:EP0182166A2
公开(公告)日:1986-05-28
A new and improved process for making phenylisopropylurea derivatives having the formula:
wherein R' is selected from hydrogen, halogen, alkyl, alkenyl, haloalkyl or R2 groups and R2 is selected from phenyl, alkyl-substituted phenyl alkoxy-substituted phenyl or haloalkyl-substituted phenyl is disclosed. The process comprises reacting a substituted urea of the formula:
with an alkenyl aromatic compound of the formula:
in a polar aprotic solvent, in the presence of an acid catalyst, preferably, sulfuric acid, substituted sulfonic acids or Lewis acids, and stirring the reaction mixture at a temperature of about 20 to 80°C until formation of the precipitated phenylisopropylurea derivative is substantially complete.
一种用于制造具有以下式子的苯基异丙基脲衍生物的改进型新工艺:
其中 R' 选自氢、卤素、烷基、烯基、卤代烷基或 R2 基团,R2 选自苯基、烷基取代的苯基、烷氧基取代的苯基或卤代烷基取代的苯基。该工艺包括使式如下的取代脲发生反应:
与式中的烯基芳香化合物反应:
在极性非烷基溶剂中,在酸催化剂(最好是硫酸、取代磺酸或路易斯酸)存在下,在约 20 至 80°C 的温度下搅拌反应混合物,直到沉淀的苯基异丙基脲衍生物的形成基本完成。