Silver(I)-mediated oxidation/cyclization of acrylamides with alkyl trifluoroborates
作者:Siyi Ding、Huaping Ren、Min Zhu、Qiang Ma、Zongcheng Miao、Pengfei Li
DOI:10.1080/00397911.2020.1846057
日期:2021.2.16
A mild silver-mediated oxidative cyclization of acrylamides has been developed by using alkyltrifluoroborates as radical precursors. It proceeds through a tandem radical addition/cyclization proce...
A silver‐catalyzed decarboxylative trifluoromethylthiolation of secondary and tertiary carboxylic acids under mild conditions tolerates a wide range of functional groups. The reaction was dramatically accelerated by its performance in an aqueous emulsion, which was formed by the addition of sodium dodecyl sulfate to water. It was proposed that the radical, which was generated from the silver‐catalyzed
ABSTRACT A rapid and highly efficient method for the radical formation using potassium alkylfluoroborates as radical precursor is devised and developed which conducts under relatively mild condition using silver(I) oxide as the oxidant. The observed silver mirror phenomenon hints at the fact that Ag2O is the real oxidant. This approach effectively overcomes the drawbacks-stringent reaction conditions
including chloro, bromo, ester, ketone, and amide. Additionally, it is not sensitive to steric hindrance. Thus, this reaction represents a very useful strategy for the production of 6-alkylated phenanthridine derivatives. The addition of alkyl radical to the isonitrile, followed by a radical aromatic cyclization, is involved in this transformation.