Photochemical Arylation of Brønsted Acids with 2-Azidobenzimidazole
作者:Alex Sudakow、Peter G. Jones、Thomas Lindel
DOI:10.1002/ejoc.201101711
日期:2012.2
Irradiation of N-benzylated 2-azidobenzimidazoles at 300 nm in the presence of an excess amount of carboxylic acids results in a novel regioselective synthesis of 2-amino-6-oxybenzimidazoles in isolated yields of 60–70 %. It is also possible to regioselectively introduce 6-bromo, 6-chloro, and 6-triflyloxy groups. Irradiation in dichloromethane in the absence of external nucleophiles revealed that