Alkynyl phenyl selenides as convenient precursors for the synthesis of stereodefined trisubstituted alkenes
作者:Marco Tingoli、Marcello Tiecco、Lorenzo Testaferri、Andrea Temperini、Giancarlo Pelizzi、Alessia Bacchi
DOI:10.1016/0040-4020(95)00153-y
日期:1995.4
the corresponding trisubstituted alkenes in which the tosyl group has been selectively substituted by an aryl or an alkyl group with retention of configuration. Finally, the cross coupling reaction of these vinyl selenides with methylmagnesium bromide, in the presence of a nickel catalyst, occurs with retention of configuration and affords the selenium free trisubstituted alkenes.
加入p -toluensulfonic酸炔基苯基硒化物是区域选择性和立体有择的,并得到(Z)-α-(phenylseleno)乙烯基p以良好的收率-toluensulfonates。从这些化合物与卤化镁的反应获得α-(苯基硒代)乙烯基卤化物。(Z)-α-(苯基硒代)乙烯基对甲苯磺酸酯与氰基癸酸酯的反应提供了相应的三取代的烯烃,其中甲苯磺酰基已被芳基或烷基选择性地取代,并且保留了构型。最后,在镍催化剂的存在下,这些乙烯基硒化物与甲基溴化镁的交叉偶联反应在保留构型的情况下发生,并提供了无硒的三取代烯烃。