Treatment of (Z)-1-bromoalk-1-enyldialkylboranes 1 with DMSO results in 1,2-migration of an alkyl group from the boron to the α-carbon without elimination of bromine to give internal (E)-alkenyl bromides 2 with excellent stereoselectivity (>99%).
Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Disubstituted Vinyl Bromides<i>via</i>Organoboranes
作者:Herbert C. Brown、N. G. Bhat、Shyamala Rajagopalan
DOI:10.1055/s-1986-31680
日期:——
BROWN H. C.; BHAT N. G.; RAJAGOPALAN SH., SYNTHESIS,(1986) N 6, 480-482
作者:BROWN H. C.、 BHAT N. G.、 RAJAGOPALAN SH.
DOI:——
日期:——
Reaction of [(Z)-1-bromo-1-alkenyl]dialkylboranes with N-halogeno compound in THF–DMF: a novel synthesis of 1,2-disubstituted (E)-vinyl bromides
作者:Masayuki Hoshi、Kazuya Shirakawa
DOI:10.1016/s0040-4039(00)00213-6
日期:2000.4
DMF-induced reaction of [(Z)-1-bromo-1-alkenyl]dialkylboranes with an N-halogeno compound results in 1,2-migration of an alkyl group from the dialkylboryl group to the alpha-carbon atom without elimination of the bromine atom, followed by beta-elimination to provide 1,2-disubstituted (E)-vinyl bromides stereoselectively in good yields. (C) 2000 Elsevier Science Ltd. All rights reserved.