Highly Efficient and Stereocontrolled Construction of 3,3′-Pyrrolidonyl Spirooxindoles via Organocatalytic Domino Michael/Cyclization Reaction
作者:Xiong-Li Liu、Wen-Yong Han、Xiao-Mei Zhang、Wei-Cheng Yuan
DOI:10.1021/ol400183k
日期:2013.3.15
A wide range of structurally diverse 3,3′-thiopyrrolidonyl spirooxindoles bearing three contiguous stereogenic centers can be smoothly obtained via a domino Michael/cyclization reaction between 3-isothiocyanato oxindoles and 3-methyl-4-nitro-5-alkenyl-isoxazoles with commercially available quinine as the catalyst under mild conditions. The protocol is significantly characterized by high reactivity
通过3-异硫氰酸根合吲哚和3-甲基-4-硝基-5-链烯基-异恶唑之间的多米诺/迈克尔/环化反应,可以平稳地获得具有三个连续立体异构中心的多种结构多样的3,3'-硫代吡咯烷二烯基螺硫辛多酯,在温和条件下可用奎宁作为催化剂。该方案的显着特点是反应活性高,催化剂负载量低(1 mol%)以及出色的非对映体和对映体选择性(高达> 99:1 dr和98%ee)。