American Chemical Society
Browse
jo025725v_si_001.pdf (219.44 kB)

A New Methodology for Synthesis of a Chiral Phosphinocarboxylic Acid through Michael Cyclization−Aldol Tandem Reaction of Chiral α,β,χ,ψ-Unsaturated Bisphosphine Oxide and Application in Palladium-Catalyzed Asymmetric Allylic Alkylation

Download (219.44 kB)
journal contribution
posted on 2002-07-11, 00:00 authored by Hideki Inoue, Yasuo Nagaoka, Kiyoshi Tomioka
Upon successive treatment with lithium diisopropylamide and then benzaldehyde, a chiral α,β,ψ,ω-unsaturated bisphosphine oxide underwent Michael cyclization−aldol tandem reaction to afford the corresponding endo-α,β-unsaturated cyclic bisphosphine oxides. Sequential stereoselective reduction and Horner−Wadsworth−Emmons olefination gave the corresponding monophosphine oxide. Oxidative conversion of an olefin moiety into a carboxyl group and subsequent deoxygenation of an oxide gave the corresponding chiral phosphinocarboxylic acid, which was successfully applied as a chiral and functionalized monophosphine ligand in a palladium-catalyzed asymmetric allylic alkylation.

History