Regioselective Base-Mediated Cyclizations of Mono-<i>N</i>-acylpropargylguanidines
作者:Justin M. Salvant、Anne V. Edwards、Daniel Z. Kurek、Ryan E. Looper
DOI:10.1021/acs.joc.7b00639
日期:2017.7.7
A regioselective base-mediated cyclization of mono-N-acylpropargylguanidines is reported. A related Ag(I)-catalyzed hydroamination strategy was recently employed to yield N-3-Cbz-protected ene-guanidines, which found utility in the synthesis of naamidine A. Herein, we report the base-catalyzed hydroamination of mono-N-acylpropargylguanidines, which proceeds with the opposite regiochemistry to deliver isomerized N-2-acyl-2-aminoimidazoles with broad substrate scope, circumventing the problematic regiospecific acylation of free 2-aminoimidazoles.