Lewis Base Effects in the Baylis−Hillman Reaction of Imines with Methyl Vinyl Ketone
作者:Min Shi、Yong-Mei Xu
DOI:10.1002/1099-0690(200202)2002:4<696::aid-ejoc696>3.0.co;2-n
日期:2002.2
In the Baylis-Hillman reaction of N-benzylidene-4-methylbenzenesulfonamide with methyl vinyl ketone (MVK), we found that, in the presence of a catlytic amount of DMAP, PPh^3 or DABCO as Lewis base, jthe Baylis-Hillman reaction can be greatly accelerated to give the normmal Baylis-Hillman adducts 1 in good or jvery jhigh yields. However, with Pbu^3 as a Lewis base, the abnormal Baylis-Hillman adducts
在N-亚苄基-4-甲基苯磺酰胺与甲基乙烯基酮(MVK)的Baylis-Hillman反应中,我们发现,在催化量的DMAP、PPh^3或DABCO作为路易斯碱存在下,Baylis-Hillman反应可以大大加速以提供正常的 Baylis-Hillman 加合物 1 的良好或非常高的产量。然而,以Pbu^3为路易斯碱,在相同的反应条件下形成了异常的Baylis-Hillman加合物2和3。还检查了取代基的影响并提出了合理的反应机制。