A One-Pot Multicomponent Coupling Reaction for the Stereocontrolled Synthesis of (<i>Z</i>)-Trisubstituted Allylic Alcohols
作者:Young K. Chen、Patrick J. Walsh
DOI:10.1021/ja0396145
日期:2004.3.1
In this Communication, we outline a new one-pot, multicomponent coupling reaction that allows easy access to (Z)-trisubstituted allylic alcohols. Our strategy is based on E to Z isomerization of the 1-bromo-1-dialkylvinylborane upon reaction with dialkylzinc reagents, and subsequent transmetalation to give (Z)-trisubstituted vinylzinc species. In situ trapping of the reactive vinylzinc intermediates with aldehydes furnished a series of (Z)-trisubstituted allylic alcohols. This method represents a viable alternative to the Still-Gennari modification of the HWE olefination reaction, and it has the advantage that it allows coupling of larger fragments.