A Stable Homodinuclear Biscobalt(III)-Schiff Base Complex for Catalytic Asymmetric 1,4-Addition Reactions of β-Keto Esters to Alkynones
作者:Zhihua Chen、Makoto Furutachi、Yuko Kato、Shigeki Matsunaga、Masakatsu Shibasaki
DOI:10.1002/anie.200805967
日期:2009.3.9
Two metal cooperation: A homodinuclear Co2–Schiff base complex Co2(OAc)2–1 promoted the asymmetric 1,4‐addition of β‐keto esters to alkynones under solvent‐free conditions in air (see scheme). The reactions proceeded without air or moisture sensitivity in high yields and with high enantioselectivities (99–91 % ee) at room temperature under highly concentrated conditions (neat–20 M) with 0.1–2.5 mol %
两个金属合作:一个同双核钴2 -Schiff碱配合物共2(OAC)2 - 1促进了不对称1,4-加成β酮酯的对alkynones无溶剂条件下,在空气中(参见方案)。反应在没有空气或湿气敏感性的情况下以高收率进行,在室温和高浓度条件下(纯净20 M),催化剂负载量为0.1到2.5 mol%时,具有高对映选择性(99-91%ee) 。