Metallic samarium and iodine promoted facile and efficient syntheses of trisubstituted alkenes from the acetates of Baylis–Hillman adducts
作者:Jian Li、Hua Xu、Yongmin Zhang
DOI:10.1016/j.tetlet.2005.01.136
日期:2005.3
Baylis–Hillman adducts underwent reductive elimination to form (E)-methylcinnamic ester derivatives. When the iodine was used in 1:1 ratio with metallic samarium, stereospecific syntheses of allylic iodide derivatives, (2Z)-2-(iodomethyl)alk-2-enoates, were achieved. Thus, this gives a new approach to the selective construction of stereo-defined trisubstituted alkenes with the simple Sm/I2 system.
由sa金属在催化量的碘存在下促进,Baylis-Hillman加合物进行还原消除,形成(E)-甲基肉桂酸酯衍生物。当碘与金属sa以1:1的比例使用时,可以实现烯丙基碘化物衍生物(2 Z)-2-(碘甲基)烷-2-烯酸酯的立体定向合成。因此,这为使用简单的Sm / I 2系统选择性构建立体定义的三取代烯烃提供了一种新方法。