Copper-Catalyzed Anti-Stereocontrolled Ring Opening of Oxabicyclic Alkenes with Grignard Reagents
作者:Ramón Gómez Arrayás、Silvia Cabrera、Juan C. Carretero
DOI:10.1021/ol034283m
日期:2003.4.1
[reaction: see text] A general copper-catalyzed procedure for the stereoselective ringopening of [2.2.1]-oxabicyclic alkenes with Grignardreagents is described. In the presence of catalytic amounts of CuCl/PPh(3) the reaction occurs with very high or complete anti selectivity in all cases.
The desymmetrization of oxabenzonorbornadienes with aluminum reagents and SimplePhos as chiral ligand is described. The corresponding homoallylic alcohols are obtained in high yield, diastereoselectivity, and enantiomeric excess. Furthermore the first anti enantioselective desymmetrization with aromatic nucleophiles is reported. (C) 2009 Elsevier Ltd. All rights reserved.