Organocatalytic Conjugate Addition of Nitroalkanes to 3-Ylidene Oxindoles: A Stereocontrolled Diversity Oriented Route to Oxindole Derivatives
作者:Arianna Quintavalla、Francesco Lanza、Elisa Montroni、Marco Lombardo、Claudio Trombini
DOI:10.1021/jo402099p
日期:2013.12.6
An efficient and highly enantioselective Michael addition of nitroalkanes to 3-ylidene oxindoles is described, mediated by thiourea-based bifunctional organocatalysts. The stereochemistry at Cα and Cβ centers is perfectly controlled, and the intermediate C-3 enolate is trapped with a second Michael acceptor. The developed one-pot three-component consecutive reactions generate up to four contiguous
描述了由基于硫脲的双官能有机催化剂介导的将硝基烷烃有效且高度对映选择性的迈克尔加成至3-亚甲基羟吲哚的方法。在C中的立体化学α和C β的中心是完全控制,并且中间C-3烯醇化物被捕获与第二迈克尔受体。已开发出的一锅式三组分连续反应以完美定义的构型生成多达四个连续的立体中心,包括C-3全碳四元中心。β-硝基羟吲哚向相应的β-氨基衍生物的转化公开了合成上有用的转化,可用于产生药学上有吸引力的分子靶标。