A Regio- and Stereo-selective Synthesis of (Z)-Alkylselanylalkenyl Bromides via Palladium(0)-catalysed Hydroboration–Bromination from Alkylselanylacetylenes†
Stereoselective synthesis of conjugated alkadienes via the palladium-catalyzed coupling reaction of (Z)- or (E)-alkenylboranes with (Z)- or (E)-2-halo-1-(alkylseleno)ethenes
作者:De Yu Yang、Xian Huang
DOI:10.1016/s0022-328x(97)00147-2
日期:1997.9
The reaction of (E)- or (Z)-1-alkenyldicyclohexylboranes (1 or 2) with either (Z)- or (E)-2-halo-1-(alkylseleno)ethenes (3 or 4) in the presence of a catalytic amount of tetrakis (triphenylphosphine) palladium and sodium methoxide provides the corresponding (Z,E)-1-alkylseleno-1,3-alkadienes (5, 6 or 7) with the retention of the configuration from the alkenylboranes and haloalkylselenoethenes.