Catalytic Asymmetric Michael Reaction of 5<i>H</i>-Oxazol-4-Ones with α,β-Unsaturated Acyl Imidazoles
作者:Bangzhi Zhang、Fengxia Han、Linqing Wang、Dan Li、Dongxu Yang、Xiaoli Yang、Junxian Yang、Xiaofang Li、Depeng Zhao、Rui Wang
DOI:10.1002/chem.201503105
日期:2015.11.23
asymmetric Michael reaction between 5H‐oxazol‐4‐ones and α,β‐unsaturated acyl imidazoles is reported. A novel 2‐benzo[b]thiophenyl‐modified chiral ProPhenol species is synthesized and used as a ligand, leading to good enantioselectivities in this asymmetric conjugate addition reaction. Furthermore, the introduction of phenol additives as achiral co‐ligands is found to improve the reaction’s chemical yields
据报道,5 H-恶唑-4-酮与α,β-不饱和酰基咪唑之间存在不对称迈克尔反应。合成了一种新型的2-苯并[ b ]硫代苯基修饰的手性脯酚,并用作配体,从而在该不对称共轭加成反应中产生了良好的对映选择性。此外,发现引入苯酚添加剂作为非手性配体可提高反应的化学收率,非对映选择性和对映选择性。