C–H functionalization of 2-alkyl tryptamines: direct assembly of azepino[4,5-b]indoles and total synthesis of ngouniensines
作者:Kejing Xie、Zeyuan Shen、Peng Cheng、Haoxiang Dong、Zhi-Xiang Yu、Liansuo Zu
DOI:10.1039/d4sc02802c
日期:——
The Pictet–Spengler type condensation of tryptamine derivatives and aldehydes or ketones is a classic reaction, and has been previously applied to assemble indole-annulated 5-, 6- and 8-membered heterocyclic rings. In this work, we further expand the synthetic scope of this reaction to the 7-membered azepino[4,5-b]indole skeleton through the direct C–H functionalization of 2-alkyl tryptamines, in which