of aldehydes or ketones in the presence of a catalytic amount of Lewis acid and molecular sieves 4A at ambient temperature to produce the corresponding alpha-(trifluoromethyl)-alpha,beta-unsaturated amides in good to excellent yields with high Z-stereoselectivity.
N,N-二烷基(
3,3,3-三氟-1-丙炔基)胺很容易通过三步法从可商购的2,2,3,3,3-五
氟丙醇开始制备。这些
氟化的炔胺在环境温度下,在催化量的
路易斯酸和
分子筛4A的存在下,与各种醛或酮平稳反应,以良好的产率获得了相应的α-(三
氟甲基)-α,β-不饱和酰胺Z-立体选择性高。