Kinetic Resolution of 2,2-Disubstituted Dihydroquinolines through Chiral Phosphoric Acid-Catalyzed C6-Selective Asymmetric Halogenations
作者:Chaofan Zhu、Wei Liu、Fei Zhao、Yunrong Chen、Houchao Tao、Yu-Peng He、Xiaoyu Yang
DOI:10.1021/acs.orglett.1c00978
日期:2021.6.4
A novel kinetic resolution of 2,2-disubstituted dihydroquinolines was achieved by regioselective asymmetric halogenations enabled by chiral phosphoric acid catalysis. A series of dihydroquinolines bearing 2,2-disubstitutions were well-tolerated in these reactions, generating both the recovered dihydroquinolines and C-6-brominated products with high enantioselectivities, with s-factors up to 149. In
通过手性磷酸催化实现的区域选择性不对称卤化,实现了 2,2-二取代二氢喹啉的新型动力学拆分。一系列带有 2,2-二取代的二氢喹啉在这些反应中具有良好的耐受性,产生具有高对映选择性的回收二氢喹啉和 C-6-溴化产物,s因子高达 149。此外,该动力学拆分方案是也适用于2,2-二取代四氢喹啉和不对称碘化反应。