Chiral bis(oxazolinylphenyl)amines proved to be efficient auxiliary ligands for iron and cobalt catalysts with high activity for asymmetrichydrosilylation of ketones and asymmetric conjugate hydrosilylation of enones.
Enantioselective Conjugate Addition of Aryl Halides and Triflates to Electron-Deficient Olefins via Nickel- and Rhodium-Catalyzed Sequential Relay Reactions
作者:Chenrui Fan、Qixu Wu、Chengfeng Zhu、Xiang Wu、Yougui Li、Yunfei Luo、Jian-Bo He
DOI:10.1021/acs.orglett.9b02940
日期:2019.11.15
Asymmetric conjugate addition of arylhalides or aryl triflates to electron-deficient olefins was realized by sequential Miyaura borylation and Hayashi-Miyaura conjugate addition in one pot. A nickel-catalyzed borylation of arylhalides or triflates and a rhodium-chiral diene complex catalyzed enantioselective conjugate addition was executed as a pair of relay reactions as a more efficient and greener
Highly Practical Catalytic Asymmetric 1,4-Addition of Arylboronic Acids in Water Using New Hydrophilic Chiral Bicyclo[3.3.0] Diene Ligands
作者:Chen-Guo Feng、Zhi-Qian Wang、Cheng Shao、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ol801665z
日期:2008.9.18
The first Rh-diene-catalyzed aqueous asymmetric1,4-addition of alpha,beta-unsaturated carbonyl compounds with arylboronic acids has been realized. By using a hydrophilic bicyclo[3.3.0] dieneligand, the reactions can be performed successfully in neat water at room temperature to afford the corresponding products in good yields and with very high enantioselectivities for both cyclic and linear substrates
Simple Chiral Diene Ligands Provide High Enantioselectivities in Transition-Metal-Catalyzed Conjugate Addition Reactions
作者:Kazuhiro Okamoto、Tamio Hayashi、Viresh H. Rawal
DOI:10.1021/ol801931v
日期:2008.10.2
Chiral dienes possessing the bicyclo[2.2.2]octadiene framework were prepared readily through the [4 + 2] cycloaddition of ( R)-alpha-phellandrene with methyl propiolate as the key step. Diene 9, substituted with a tertiary alcohol on one of the two double bonds, is prepared in just one step from the cycloadduct and is highly effective as a chiralligand for rhodium-catalyzedasymmetricconjugate addition
Electronically deficient ( Rax , S , S )-F 12 -C 3 -TunePhos and its applications in asymmetric 1,4-addition reactions
作者:Shu-Bo Hu、Zhang-Pei Chen、Ji Zhou、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2016.03.072
日期:2016.4
diphosphine ligand (Rax,S,S)-F12-C3-TunePhos has been concisely synthesized. The electron-poor ligand features both chiral centers and chiral axis bearing fluoro-functional groups on each phosphorus phenyl ring based on C3-TunePhos backbone. The catalyst composed of this ligand and rhodium showed excellent activities and enantioselectivities in asymmetric 1,4-addition reactions of arylboronic acids to