Palladium‐catalyzed cyclization reaction of N‐(2‐Haloaryl)alkynylimines: Synthesis of 3‐acylindoles using water as the sole solvent and oxygen source
作者:An‐An Zhang、Tuanjie Meng、Wenli Wang、Xueli Liu、Yupei Zhu、Lantao Liu
DOI:10.1002/aoc.5513
日期:2020.4
efficient strategy for the preparation of 3‐acylindoles via palladium‐catalyzed cyclization reaction of N‐(2‐haloaryl)alkynylimines in water has been developed. The reaction tolerates a wide range of functional groups, and the corresponding 3‐acylindoles were obtained in high yields using water as the sole solvent and oxygen sources. Additionally, this method could provide a short synthesis route for
3-Aroylindoles have been prepared via copper-catalyzed cyclization of N-(2-iodoaryl)enaminones, readily available from 2-iodoanilines and α,β-ynones. The reaction tolerates a variety of useful functionalities including ether, keto, cyano, bromo, and chloro substituents. This indole synthesis can also be carried out from 2-iodoanilines and α,β-ynones through a sequential process that omits the isolation of enaminone intermediates.