Triisobutylaluminium promoted reductive rearrangement of substituted vinyl ethers to homologous alcohols
作者:Bérengère du Roizel、Matthieu Sollogoub、Alan J. Pearce、Pierre Sinaÿ
DOI:10.1039/b003277h
日期:——
Substituted vinyl ethers carrying electron-donating groups in
the ether moiety undergo smooth oxygen to carbon rearrangement with
triisobutylaluminium to afford chain extended alcohols.
Tuneable superbase-catalyzed vinylation of α-hydroxyalkylferrocenes with alkynes
作者:Boris A. Trofimov、Ludmila A. Oparina、Olga A. Tarasova、Alexander V. Artem'ev、Vladimir B. Kobychev、Yuriy V. Gatilov、Alexander I. Albanov、Nina K. Gusarova
DOI:10.1016/j.tet.2014.06.010
日期:2014.9
Superbase-catalyzed (KOH/DMSO suspension as a catalyst) vinylation of hydroxymethyl- and hydroxyethylferrocenes with terminal and internal alkynes (acetylene, propyne, phenylacetylene, 3-ethynylpyridine, 1-propyn-1-yl-benzene, diphenylacetylene) affords hitherto unknown vinyl ethers of ferrocene in 30-93% yields depending on the alkyne structure and the tuneable ratio of reactants/KOH/DMSO. The vinylation smoothly proceeds under mild conditions (70-90 degrees C, 025-13 h). With unsubstituted acetylene the process is readily realized under atmospheric pressure (yield of the corresponding vinyl ethers is 81-90%) though under pressure (initial pressure at room temperature is 10-13 atm, maximum pressure is 13-16 atm at the reaction temperature) the yield is close to quantitative (93%). The synthesized compounds were characterized using H-1 and C-13 NMR, and IR spectroscopy, as well as X-ray diffraction analysis. (C) 2014 Elsevier Ltd. All rights reserved.