Chiral N-tert-butanesulfinyl α,β-unsaturated ketimine: a simple and highly effective olefin/sulfinimide hybrid ligand for asymmetric 1,4-additions
作者:Xiangqing Feng、Beibei Wei、Jing Yang、Haifeng Du
DOI:10.1039/c1ob05971h
日期:——
One novel type of chiral olefin/sulfinimide hybrid ligands has been developed through a simple one-step condensation of α,β-unsaturated ketones with tert-butanesulfinamide and utilized successfully for rhodium-catalyzedasymmetricconjugatedadditions to furnish the desired adducts in high yields with excellent ee's.
Chiral [2.2.2] Dienes as Ligands for Rh(I) in Conjugate Additions of Boronic Acids to a Wide Range of Acceptors
作者:Christian Defieber、Jean-François Paquin、Sonia Serna、Erick M. Carreira
DOI:10.1021/ol048240x
日期:2004.10.1
[reaction: see text] We document a series of investigations that led to new substituted [2.2.2]-diene ligands which display high selectivity in Rh(I)-catalyzed conjugate addition reactions to substrates not previously examined with diene ligands. Moreover, we disclose an unexpected, interesting effect that results from the introduction of a third C=C onto the ligand scaffold (cf. 1).
α,β-Divinyl Tetrahydropyrroles as Chiral Chain Diene Ligands in Rhodium(I)-Catalyzed Enantioselective Conjugated Additions
作者:Qian Li、Zhe Dong、Zhi-Xiang Yu
DOI:10.1021/ol103152t
日期:2011.3.4
A series of α,β-divinyl tetrahydropyrroles, synthesized by asymmetric allylic C−H bond activation/conjugated diene addition reaction of ene-2-dienes, were found to be very efficient chiral chain diene ligands in the rhodium-catalyzedconjugatedaddition of organoboronic acids to various α,β-unsaturated compounds, achieving the desired chiral adducts with good to excellent yields and ee values.
BINOL-Based Diphosphonites as Ligands in the Asymmetric Rh-Catalyzed Conjugate Addition of Arylboronic Acids
作者:Manfred T. Reetz、Dominique Moulin、Andreas Gosberg
DOI:10.1021/ol010219y
日期:2001.12.1
[reaction: see text] BINOL-based diphosphonites having achiral backbones are useful ligands in the Rh-catalyzedconjugateaddition of arylboronic acids to alpha,beta-unsaturated carbonyl compounds. The nature of the achiral backbone determines the direction and degree of enantioselectivity, with er values of up to 99.5:0.5 possible.
Simple Oxazolidine Chiral Diene Ligands for Enantioselective Rh-Catalyzed Conjugate Additions
作者:David Carbery、Nathan Fairhurst、Rachel Munday
DOI:10.1055/s-0032-1318135
日期:——
Simple oxazolidine-based chiral diene ligands, ultimately derived from serine, have been synthesized using the Seebach self-regeneration of stereocenters strategy. The ligands have been used in the enantioselectiveRh-catalyzedconjugateaddition of aryl boronic acids to cyclohexenone. An efficient ‘in vacuo’ reaction protocol has been developed as part of this study.