Chiral <i>C</i><sub>2</sub>-Symmetric Ligands with 1,4-Dioxane Backbone Derived from Tartrates: Syntheses and Applications in Asymmetric Hydrogenation
作者:Wenge Li、Jason P. Waldkirch、Xumu Zhang
DOI:10.1021/jo020250t
日期:2002.11.1
Chiral 1,4-diphenylphosphines 5-7 as well as thioether 8 were synthesized from tartrates employing Ley's "BDA" and "Dispoke" methodologies as the key step. Rhodium(I) complexes with 5-7 are efficient catalysts for the asymmetrichydrogenation of beta-substituted enamides and MOM-protected beta-hydroxyl enamides, which furnished chiral amines or beta-amino alcohols with 94-->99% ee. These results indicated
Development of DIOP derivatives as efficient ligands for asymmetric hydrogenation: factors controlling the reactivities and enantioselectivities
作者:Duan Liu、Wenge Li、Xumu Zhang
DOI:10.1016/j.tetasy.2004.05.042
日期:2004.7
Several DIOP derivatives have been developed as efficient ligands for Rh and Ir-catalyzed asymmetric hydrogenations. The conformational mobility of the backbone in this type of ligand plays an important role in governing both the reactivity and enantioselectivity. Isolation of pure pre-catalyst is another key factor to obtain high catalytic activity. (C) 2004 Published by Elsevier Ltd.
US6399787B1
申请人:——
公开号:US6399787B1
公开(公告)日:2002-06-04
[EN] CATALYTIC ASYMMETRIC HYDROGENATION, HYDROFORMYLATION, AND HYDROVINYLATION VIA TRANSITION METAL CATALYSTS WITH PHOSPHINES AND PHOSPHITES<br/>[FR] HYDROGENATION CATALYTIQUE ASYMETRIQUE, HYDROFORMULATION, ET HYDROVINYLATION VIA DES CATALYSEURS A METAUX DE TRANSITION AVEC PHOSPHINES ET PHOSPHITES
申请人:THE PENN STATE RESEARCH FOUNDATION
公开号:WO1999059721A1
公开(公告)日:1999-11-25
(EN) Novel transition metal catalysts with conformationally rigid chiral phosphines and phosphites are developed for asymmetric carbon-hydrogen and carbon-carbon bond formation. The invention emphasizes synthesis of chiral amines, $g(b)-amino acids and related compounds via catalytic asymmetric hydrogenation based on chiral monodentate and bidentate phosphines with cyclic ring structures. The ligands contain rigid ring structures.(FR) L'invention concerne l'élaboration de catalyseurs à métaux avec phosphines et phosphites de forme chirale à rigidité conformationnelle, pour la formation de liaisons asymétriques carbone-hydrogène et carbone-carbone. L'invention porte en particulier sur la synthèse d'amines chirales, de bêta-aminoacides et de composés connexes par hydrogénation catalytique asymétrique reposant sur des phosphines chirales monodentées et bidentées qui présentent des structures à noyau cyclique. Les ligands présentent des structures à noyau rigide.