Asymmetric catalysis based on chiral phospholanes and hydroxyl phospholanes
申请人:The Penn State Research Foundation
公开号:US06727377B2
公开(公告)日:2004-04-27
Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.
A chiral hydroxyl bisphospholane, 1,2-bis[(2S,3S,4S,5S)-3,4-dihydroxyl-2,5-dimethylphospholanyl]benzene (4), was synthesized from readily available d-mannitol. Its Rh(I) complex catalyzes asymmetric hydrogenation of dehydroaminoacids and their ester derivatives with excellent enantioselectivities (98 to >99% ee).
Hybrid P-chiral diphosphines for asymmetric hydrogenation
作者:Duncan Carmichael、Henri Doucet、John M. Brown
DOI:10.1039/a808711c
日期:——
A family of diphosphine ligands has been prepared by Michael addition of o-anisylphenyl phosphide to diethyl vinylphosphonate and elaboration to phospholanes based on hexane-2,5-diol or mannitol; some preliminary results of Rh-complex catalysed hydrogenations are reported.