Catalytic enantioselective conjugate addition of Grignard reagents to cyclic α,β-unsaturated carbonyl compounds
作者:Motomu Kanai、Yuichi Nakagawa、Kiyoshi Tomioka
DOI:10.1016/s0040-4020(99)00095-2
日期:1999.3
A catalytic asymmetric conjugate addition reaction of organocopper reagents, generated from copper salt, a chiral phosphine, and Grignard reagent, with cyclohexenone is highly dependent on the counter anion of copper species, solvents, Grignard reagents, and the structure of the chiral phosphine. The reaction using the combination of 8 mol% of copper iodide, 32 mol% of the amidophosphine 3, and 1.2
由铜盐,手性膦和格氏试剂与环己烯酮产生的有机铜试剂的催化不对称共轭加成反应高度依赖于铜离子,溶剂,格氏试剂和手性膦结构的抗衡阴离子。在-78°C下,使用8摩尔%的碘化铜,32摩尔%的氨基膦3和1.2当量的有机氯化镁与环己烯酮在乙醚中的混合物进行反应,得到3-取代的环己酮,其ee最高为92%,ee为90 % 屈服。