Regioselective Bromination of Fused Heterocyclic <i>N</i>-Oxides
作者:Sarah E. Wengryniuk、Andreas Weickgenannt、Christopher Reiher、Neil A. Strotman、Ke Chen、Martin D. Eastgate、Phil S. Baran
DOI:10.1021/ol3034675
日期:2013.2.15
A mild method for the regioselective C2-bromination of fused azine N-oxides is presented, employing tosic anhydride as the activator and tetra-n-butylammonium bromide as the nucleophilic bromide source. The C2-brominated compounds are produced in moderate to excellent yields and with excellent regioselectivity in most cases. The potential extension of this method to other halogens, effecting C2-chlorination