Chiral phosphoric acid-catalyzed regioselective synthesis of spiro aminals with quaternary stereocenters
作者:Xin-Wei Wang、Mu-Wang Chen、Bo Wu、Baomin Wang、Boshun Wan、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2020.152793
日期:2021.2
A chiral phosphoric acid-catalyzed enantioselective synthesis of spiro[indoline-3,6′-indolo[1,2-c]quinazolin]-2-ones has been developed by condensation/N-alkylation cascade from 2-(1H-indolyl)anilines and isatins, affording the spiro aminals with quaternary stereogenic centers with up to 93% ee. The protocol could be expanded to 2-(3,5-dimethyl-1H-pyrrol-2-yl)aniline and a variety of pyrrole-derived
通过2-/ (1H-吲哚基)缩合/ N-烷基化级联反应,开发了手性磷酸催化的螺[吲哚啉-3,6'-吲哚[1,2- c ]喹唑啉] -2-酮的对映选择性合成。苯胺和isatins,为螺旋螺旋动物提供了高达93%ee的四级立体生成中心。该方案可以扩展为2-(3,5-二甲基-1 H-吡咯-2-基)苯胺,并且还获得了多种吡咯衍生的螺手性缩醛胺,收率高(71–91%),具有出色的对映选择性(89%-94%ee)。