Chemo- and Regioselective Assembly of Polysubstituted Pyridines and Isoquinolines from Isocyanides, Arynes, and Terminal Alkynes
作者:Feng Sha、Luling Wu、Xian Huang
DOI:10.1021/jo300072x
日期:2012.4.20
strategy for polysubstitutedpyridines and isoquinolines with high chemo- and regioselectivity. In this methodology, 1-alkynyl imines act as the key compound to undergo a sequential alkynyl imine–allenyl imine isomerization/aza-Diels–Alder reaction/aromatization. In the first place, 1-alkynyl imines were formed in situ by a highly selective multicomponentreaction of isocyanides, arynes, and terminal alkynes
Cyclization of N-(propargylic)hydroxylamines catalyzed by AgBF4 afforded the corresponding 4-isoxazolines in good yields. Copper salts were found to promote the further transformation to acylaziridines. The combined use of AgBF4 and CuCl realized direct transformation of N-(propargylic)hydroxylamines into cis-acylaziridines.