AgOTf and TfOH co-catalyzed isoquinoline synthesis via redox reactions of O-alkyl oximes
摘要:
Under AgOTf and Bronsted acid co-catalysis, O-alkyl o-alkynylbenzaldoxime derivatives undergo a cyclization-induced N-O cleavage to produce isoquinolines with the simultaneous oxidation of O-alkyl group. This redox-based method provides a general access to diverse isoquinoline-derived heterocycles that are simple, efficient, and tolerant of various functional groups from readily available and hydrolytically stable oxime precursors. (C) 2009 Elsevier Ltd. All rights reserved.
Gold-Catalyzed Ammonium Acetate Assisted Cascade Cyclization of 2-Alkynylarylketones
作者:Maciej E. Domaradzki、Yuhua Long、Zhigang She、Xiaochen Liu、Gan Zhang、Yu Chen
DOI:10.1021/acs.joc.5b01939
日期:2015.11.20
An ammonium acetate assisted gold-catalyzedcascadecyclization reaction of 2-alkynylarylketones is described. Under the reported conditions, a gold-catalyzed intramolecular cyclization of 2-alkynylarylketones takes place through two competing reaction mechanisms—a 5-exo-dig or a 6-endo-dig cyclization—leading to two regioisomeric intermediates: isobenzofuranium or isobenzopyrylium. In the presence
A copper(I)-catalyzed tandemreaction of 2-bromoaryl ketones, terminal alkynes, and CH3CN is developed, which combines N atom transfer and three-component [3 + 2 + 1] cyclization, and efficiently produces densely functionalized isoquinolines in a facile, highlyselective, and general manner. In the reaction, the formation of aromatic C–N bonds along with the complete C–N triple bond cleavage is first