Remote Control of Axial Chirality: Synthesis of Spirooxindole–Urazoles via Desymmetrization of ATAD
作者:Lin-Lin Zhang、Ji-Wei Zhang、Shao-Hua Xiang、Zhen Guo、Bin Tan
DOI:10.1021/acs.orglett.8b02361
日期:2018.10.5
control of axial chirality in an asymmetric three-component reaction. This transformation was realized by a tandem bisthiourea-catalyzed asymmetric Diels–Alder reaction and substrate-controlled asymmetric ene reaction. The driving force derived from aromatization and the high reactivity of 4-aryl-1,2,4-triazole-3,5-dione enophiles mediated the occurrence of the successive ene reaction under mild conditions
首次通过非对称化策略,通过对不对称三组分反应中轴向手性的远程控制,组装了具有N -Ar立体轴的一类光学纯螺氧基吲哚-脲基化合物。这种转化是通过串联双硫脲催化的不对称Diels-Alder反应和受底物控制的不对称烯反应实现的。来自芳构化的驱动力和4-芳基-1,2,4-三唑-3,5-二酮亲和剂的高反应性介导了在温和条件下发生连续的烯反应。