Reactions of 7-nitropyrido[1,2-a]benzimidazolium salts with hydrazines and hydroxylamine

We are the first to show that quaternary 7-nitropyrido[1,2-a] benzimidazolium salts are cleaved by hydrazine, phenylhydrazine, and hydroxylamine to form 2-pyrazolinemethyl- and 2-isoxazoline-methyl-6- nitrobenzimidazoles. © 2010 Springer Science+Business Media, Inc.