Catalytic Asymmetric [3+2] Annulation of Allylsilanes with Isatins: Synthesis of Spirooxindoles
作者:Nadine V. Hanhan、Nicolas R. Ball-Jones、Ngon T. Tran、Annaliese K. Franz
DOI:10.1002/anie.201105739
日期:2012.1.23
Silyl‐inspired spirocycle: The title reaction is the first example of a catalytic asymmetric [3+2] annulation reaction with allylsilanes. The annulation reaction utilizes a chiral ScCl2(SbF6)/L catalyst and TMSCl as a promoter to afford spirooxindoles in excellent enantioselectivity at room temperature. The SiC bond can be oxidized to deliver hydroxy‐substituted spirooxindoles. TMS=trimethylsilyl
Silyl-inspired spirocycle:标题反应是与烯丙基硅烷催化不对称 [3+2]环化反应的第一个例子。环化反应利用手性 ScCl 2 (SbF 6 )/L 催化剂和 TMSCl 作为促进剂,在室温下以优异的对映选择性提供螺环吲哚。所述Si C键的可被氧化以提供羟基取代spirooxindoles。TMS=三甲基甲硅烷基。