A Homodinuclear Mn(III)<sub>2</sub>−Schiff Base Complex for Catalytic Asymmetric 1,4-Additions of Oxindoles to Nitroalkenes
作者:Yuko Kato、Makoto Furutachi、Zhihua Chen、Harunobu Mitsunuma、Shigeki Matsunaga、Masakatsu Shibasaki
DOI:10.1021/ja903566u
日期:2009.7.8
Catalytic asymmetric 1,4-additions of 3-substituted oxindoles to beta-aryl, beta-heteroaryl, and beta-alkenyl nitroalkenes are described. A new homodinuclear Mn(2)(OAc)(2)-Schiff base 1 complex was required to realize high diastereo- and enantioselectivity. Mn(2)(OAc)(2)-1 (1-5 mol %) promoted the 1,4-additions in 99-83% yield, 96-85% ee, and >30:1-5:1 dr at room temperature, providing useful chiral
描述了催化不对称 1,4-加成 3-取代 oxindoles 到 β-芳基、β-杂芳基和 β-烯基硝基烯烃。需要一种新的同双核 Mn(2)(OAc)(2)-Schiff base 1 复合物来实现高非对映选择性和对映选择性。Mn(2)(OAc)(2)-1 (1-5 mol %) 以 99-83% 的产率、96-85% 的 ee 和 >30:1-5:1 dr 促进 1,4-加成室温下,为合成具有邻位季/叔碳立体中心的 β-氨基羟吲哚提供有用的手性构件。