Tandem Michael−Wittig−Horner Reaction: One-Pot Synthesis of δ-Substituted α,β-Unsaturated Carboxylic Acid Derivatives − Application to a Concise Synthesis of (Z)- and (E)-Ochtoden-1-al
A new tandem Michael−Wittig−Horner reaction has been developed to produce in high yields δ-substituted α,β-unsaturated esters, amides and lactones. The reaction has been successfully applied to a concise synthesis of (E)- and (Z)-ochtoden-1-als, components of the male sex pheromone of boll weevil from 3-methylcyclohex-2-en-1-one.
Tandem Michaël-Wittig Horner reaction one-pot synthesis of δ-substituted α,β-unsaturated esters
作者:Olivier Piva、Sébastien Comesse
DOI:10.1016/s0040-4039(97)01729-2
日期:1997.10
direct synthesis of δ-substituted α,β-unsaturatedesters from unsubstituted al dehydes or ketones has been accomplished in high yield by a taodem 1,4-addition and Wittig-Horner reaction. The Copper-enolate obtained after the first step was able to deprotonate the highly acidic phosphonate generating thus the two components necessary for the second coupling reaction.
Stabilization and activation of dienolates with germanium and tin. Stereo- and regioselective aldol reactions, regioselective coupling reactions, and regioselective synthesis of amino acid derivatives