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
摘要:
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.
The Synthesis of Internal Conjugated (<i>E</i>)-Enynyldialkylboranes and Their Applications to the Syntheses of Conjugated Alkynones, Conjugated (<i>E</i>)-Enynes, and Conjugated Enynes Bearing an Unsaturated Group on the Double Bond
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.58.1683
日期:1985.6
(E)-Enynyldialkylboranes, thus obtained, gave regio- and/or stereospecifically defined corresponding conjugated alkynones by alkaline hydrogen peroxide oxidation, conjugated (E)-enynes by protonolysis with acetic acid, and conjugated enynes bearing an unsaturated group on the internal alkenyl carbon atom by bis(acetylacetonato)copper-catalyzed cross-coupling reaction with allyl bromide or 1-bromo-1-hexyne respectively
A Novel Synthesis of Internal Alkenyldialkylborane by the Reaction of 1-Halo-1-alkenyldialkylborane with Grignard Reagent
作者:Akira Arase、Masayuki Hoshi、Yuzuru Masuda
DOI:10.1246/bcsj.57.209
日期:1984.1
To synthesize internal alkenyldialkylboranes, coupling reactions were carried out by using 1-halo-l-alkenyldialkylboranes and Grignardreagents. Hydrogen peroxide oxidation and protonolysis with acetic acid of the reaction product revealed that internal (E)-alkenyldialkylborane was formed in 60–90% yield.
The Reactions of (1-Halo-1-alkenyl)dialkylboranes with Lead(IV) Acetate or (Diacetoxyiodo)benzene. A Stereoselective Synthesis of 1-Halo-1,2-dialkylethylenes
作者:Yuzuru Masuda、Akira Arase、Akira Suzuki
DOI:10.1246/bcsj.53.1652
日期:1980.6
The reaction of (1-halo-1-alkenyl)dialkylboranes with lead(IV) acetate or (diacetoxyiodo)benzene was studied. (1-Bromo-1-alkenyl)dialkylboranes gave 1-bromo-1,2-dialkylethylenes. When alkyl groups ...