Substrate Controlled Regioselective Bromination of Acylated Pyrroles Using Tetrabutylammonium Tribromide (TBABr<sub>3</sub>)
作者:Shuang Gao、Travis K. Bethel、Tayeb Kakeshpour、Grace E. Hubbell、James E. Jackson、Jetze J. Tepe
DOI:10.1021/acs.joc.8b01251
日期:2018.8.17
Electrophilic bromination of pyrroles bearing carbonyl substituents at C-2 typically results in a mixture of the 4- and 5-brominated species, generally favoring the 4-position. Herein, we describe a substrate-controlled regioselective bromination in which tetra-butyl ammonium tribromide (TBABr3) reacts with pyrrole-2-carboxamide substrates to yield the 5-brominated species as the predominant (up to