A new simple and efficient transformation of aromatic aldehydes into α-chlorocinnamaldehydes is described. Catalytic olefination reaction of hydrazones of aromatic aldehydes with 2-trichloromethyl-1,3-dioxolane gives ethylene acetals of target alkenes in moderate to good yields. The reaction proceeds stereoselectively to form preferably Z-isomers.
报道了一种将芳香醛转化为α-
氯肉桂醛的新型简单高效转化方法。催化炔丙化反应,利用芳香醛的踪与2-三
氯甲基-1,3-
二恶烷反应,以中等至良好产率得到目标
烯烃的
乙烯缩醛。该反应立体选择性地进行,优先形成Z-异构体。