Metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphatic aldehydes: a convenient approach to oxindoles via dual C(sp<sup>2</sup>)–H bond functionalization
作者:Luo Yang、Wen Lu、Wang Zhou、Feng Zhang
DOI:10.1039/c6gc00362a
日期:——
A convenient metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphaticaldehydes to provide quaternary oxindoles is developed.
N-(Acyloxy)phthalimides as tertiary alkyl radical precursors in the visible light photocatalyzed tandem radical cyclization of N-arylacrylamides to 3,3-dialkyl substituted oxindoles
light promoted tandem radical cyclization of N-arylacrylamides with N-(acyloxy)phthalimides to 3,3-dialkyl substituted oxindoles was developed. In the presence of a photocatalyst Ru(bpy)3Cl2·6H2O, an organic base i-Pr2NEt and the irradiation of a 25 W compact fluorescence bulb at room temperature, N-(acyloxy)phthalimides may be used as a masking group for tertiary alkyl radicals. This tandem radical
report the first metal-free, redox-neutral strategy for radical cascade alkylative radical addition, cyclization of N-arylacrylamides with unactivated alkylchlorides to give corresponding 3,3-disubstituted oxindoles in moderate to good yields. This transformation’s salient features are the utilization of an organo photocatalyst, mild reaction conditions, and broad substrate scope. Moreover, this methodology
Organocatalyzed arylalkylation of activated alkenes via decarboxylation of PhI(O2CR)2: efficient synthesis of oxindoles
作者:Tao Wu、Hao Zhang、Guosheng Liu
DOI:10.1016/j.tet.2012.03.051
日期:2012.7
A novel organocatalyzed arylalkylation of activated alkenes has been developed. This reaction was initiated from the decomposition of PhI(O2CR)(2) to generate alkyl radical, followed by addition to alkenes. Then the formed radical was trapped by aromatic ring to generate the cyclized products. This method presents an efficient road to synthesis of a variety of oxindoles. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.