Chemoselective Intramolecular Functionalization of Methyl Groups in Nonconstrained Molecules Promoted by <i>N</i>-Iodosulfonamides
作者:Nieves R. Paz、Dionisio Rodríguez-Sosa、Haydee Valdés、Ricardo Marticorena、Daniel Melián、M. Belén Copano、Concepción C. González、Antonio J. Herrera
DOI:10.1021/acs.orglett.5b00866
日期:2015.5.15
Mechanistic evidence observed in Hofmann-Loffler-Freytag-type reactions has been crucial to achieve the chemoselective functionalization of methyl groups under mild conditions. Radical-mediated methyl iodination and subsequent oxidative deiodination are the key steps in this functionalization, where iodine chemistry has a pivotal role on the formation of the C-N bond. The concepts of single hydrogen atom transfer (SHAT) and multiple hydrogen atom transfer (MHAT) are introduced to describe the observed chemoselectivity.