On the Mechanism of the Copper-Catalyzed Enantioselective 1,4-Addition of Grignard Reagents to α,β-Unsaturated Carbonyl Compounds
作者:Syuzanna R. Harutyunyan、Fernando López、Wesley R. Browne、Arkaitz Correa、Diego Peña、Ramon Badorrey、Auke Meetsma、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ja0585634
日期:2006.7.19
The mechanism of the enantioselective 1,4-addition of Grignard reagents to alpha,beta-unsaturated carbonyl compounds promoted by copper complexes of chiral ferrocenyl diphosphines is explored through kinetic, spectroscopic, and electrochemical analysis. On the basis of these studies, a structure of the active catalyst is proposed. The roles of the solvent, copper halide, and the Grignard reagent have
通过动力学、光谱和电化学分析探索了由手性二茂二膦的铜配合物促进的格氏试剂对映选择性 1,4-加成到 α、β-不饱和羰基化合物的机制。在这些研究的基础上,提出了活性催化剂的结构。已经检查了溶剂、卤化铜和格氏试剂的作用。动力学研究支持将还原消除作为涉及手性催化剂、底物和格氏试剂的限速步骤。热力学活化参数由反应速率的温度依赖性确定。讨论了假定的活性物质和反应的催化循环。