TfOH-Catalyzed Cascade C–H/N–H Chemo-/Regioselective Annulation of Indole-2-carboxamides with Benzoquinones for the Construction of Anticancer Tetracyclic Indolo[2,3-<i>c</i>]quinolinones
作者:Lingkai Kong、Wenyue Tian、Zhiyan Liu、Ting Xu、Haoyue Wen、Zihan Chen、Jin Gao、Li-Ping Bai
DOI:10.1021/acs.joc.2c00598
日期:2022.6.17
An efficient TfOH-catalyzed cascade C–H/N–H annulation of indole-2-carboxamides with benzoquinones has been developed for the synthesis of tetracyclic indolo[2,3-c]quinolinones. This reaction exhibits excellent chemo-/regioselectivity, achieving functionalization of the C-3 of indole and N–H of the amide moiety to form the new C–C and C–N bonds. Various expected products were synthesized from readily
已开发出一种有效的 TfOH 催化级联 C-H/N-H 环化吲哚-2-甲酰胺与苯醌,用于合成四环吲哚[2,3- c ]喹啉酮。该反应表现出优异的化学/区域选择性,实现了吲哚的 C-3 和酰胺部分的 N-H 官能化,形成新的 C-C 和 C-N 键。从容易获得的起始材料以良好至高产率合成了各种预期产物,具有广泛的底物范围和良好的官能团耐受性。在所有合成产品中,3d对 4T1 癌细胞系的细胞毒性最强,IC 50值为 0.62 ± 0.05 μM。体内研究表明,3d显着抑制了 4T1 异种移植肿瘤的生长而没有体重减轻。