Synthesis of Cyclopenta[
<i>b</i>
]indoles via a Formal [3+2] Cyclization of
<i>N</i>
‐Sulfonyl‐1,2,3‐triazoles and Indoles
作者:Shengguo Duan、Wan Zhang、Yuntong Hu、Ze‐Feng Xu、Chuan‐Ying Li
DOI:10.1002/adsc.202000624
日期:2020.9.8
Annulation of benzoxy‐tethered N‐sulfonyl‐1,2,3‐triazoles and indoles has been developed in this paper, providing an efficient and convenient access to valuable cyclopenta[b]indoles in moderate to good yields. α,β‐Unsaturated imine, which generated in situ from denitrogenation and 1,2‐OBz migration of triazole, provided three carbons for the formal [3+2] cyclization reaction for the first time.
本文开发了苯氧基束缚的N-磺酰基-1,2,3-三唑和吲哚的环化反应,可有效,方便地获得中度到良好收率的有价值的环戊[ b ]吲哚。由三唑的脱氮和1,2-OBz迁移原位产生的α,β-不饱和亚胺,首次为正式的[3 + 2]环化反应提供了三个碳。