Green halogenation of aromatic heterocycles using ammonium halide and hydrogen peroxide in acetic acid solvent
作者:Danielle N. D’Aleo、Sheena R. Allard、Cassandra C. Foglia、Shawna L.M. Parent、David J. Rohr、Christine Gottardo、Craig D. MacKinnon
DOI:10.1139/cjc-2013-0058
日期:2013.8
acid allows access to aromatic heterocyclic halides in yields and purities comparable to syntheses employing N-bromosuccinimide. In activated and unsubstituted thiophenerings, regioselectivity is quantitative for positions α to the sulfur; pyrroles also give quantitative reactions, at least initially. Deactivated rings, including furans and thiazoles, as well as thiophenes with strongly electron-withdrawing