Regio- and Stereoselective Conversion of Terminal Alkylselenoacetylenes into (E)-2-Alkylseleno-1-Vinylic Iodides via Hydroboration-Iodination
摘要:
The hydroboration of terminal alkylselenoacetylenes 1 in the presence of 3 mol% of Pd (PPh(3))(4) with catecholborane 2 followed by hydrolysis, undergo a rapid reaction with iodine under the influence of sodium hydroxide at-10 degrees C in THF to afford a novel method for the regio-and stereospecific synthesis of (E)-2-alkylseleno-1-vinyl iodides 4.
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.