The aerobic oxidation of pyrrolones catalyzed by Fe(OTf)3 to form reactive N-acyliminium ion intermediates that undergo nucleophilic additions to give the corresponding products is described.
Iron‐Catalyzed Carbenoid‐Transfer Reactions of Vinyl Sulfoxonium Ylides: An Experimental and Computational Study
作者:Janakiram Vaitla、Annette Bayer、Kathrin H. Hopmann
DOI:10.1002/anie.201810451
日期:2018.12.3
the generation of unprecedented vinyl carbenoids from sulfoxonium ylides has been developed and applied in the synthesis of a diverse array of heterocycles such as indolizines, pyrroles, 3‐pyrrolin‐2‐ones, and furans. The reactions proceed by FeBr2 catalysis under mild reaction conditions with a broad substrate scope. A reaction pathway involving iron carbenoids is proposed based on a series of control
carboxylic acids (acid iteration sequence) in one direction and the sequential addition of the carboxylic acids to the vinyl sulfoxonium ylide (ylide iteration sequence) in another direction yield (Z)-configured unsaturated oligoesters. To perform this iteration, we have developed a highly regioselective insertion of vinyl sulfoxonium ylide into the X–H (X = O, N, C, S, halogen) bond of acids, thiols