Consecutive Ring Expansion and Contraction for the Synthesis of 1-Aryl Tetrahydroisoquinolines and Tetrahydrobenzazepines from Readily Available Heterocyclic Precursors
作者:Jessica E. Hill、Johnathan V. Matlock、Quentin Lefebvre、Katie G. Cooper、Jonathan Clayden
DOI:10.1002/anie.201802188
日期:2018.5.14
and tetrahydrobenzazepines were prepared by acid‐promoted ring contraction of cyclic ureas, which were themselves formed by ringexpansion of indolines and tetrahydroquinolines. The consequent overall one‐carbon insertion reaction gives these 6‐ and 7‐membered heterocyclic scaffolds in three steps from readily available precursors. Other ring sizes may be formed by an alternative elimination reaction