Cu−Catalyzed Enantioselective Conjugate Addition of Alkylzincs to Cyclic Nitroalkenes: Catalytic Asymmetric Synthesis of Cyclic α-Substituted Ketones
作者:Courtney A. Luchaco-Cullis、Amir H. Hoveyda
DOI:10.1021/ja020605q
日期:2002.7.1
highly enantioselective (>/=92% ee) catalytic method for conjugate addition of alkylzinc reagents to cyclic nitroalkenes is reported. Reactions are promoted in the presence of 0.5-5 mol % (CuOTf)2.C6H6 and 1-10 mol % of chiral amino acid-based phosphine ligands at 0 degrees C in toluene. The Cu-catalyzed reactions can be effectively carried out with small-, medium-, and large-ring nitroalkenes. Depending
报道了一种高效且高度对映选择性 (>/=92% ee) 的催化方法,用于将烷基锌试剂与环状硝基烯烃共轭加成。反应在 0.5-5 mol% (CuOTf)2.C6H6 和 1-10 mol% 手性氨基酸基膦配体的存在下在 0 摄氏度的甲苯中得到促进。Cu催化的反应可以与小环、中环和大环硝基烯烃有效地进行。根据所使用的反应条件,本协议可以很容易地访问硝基或相应的 α 取代酮产品。