The formation of benzimidazolones and quinoxalines from o-nitro-phenyldialkylanilines: a re-investigation
作者:R. K. Grantham、O. Meth-Cohn
DOI:10.1039/j39690000070
日期:——
earlier reports, the action of acetic anhydride and zincchloride on 2,4-dinitrodiethylaniline does not give 4-acetyl-1-ethyl-6-nitro-1,2,3,4-tetrahydroquinoxalin-3-one (IIIb) but 2-acetoxymethyl-1-ethyl-5-nitrobenzimidazole (IVb). The reaction has been extended to a variety of mono- and di-nitrophenyl-N-heterocycles to give good yields of benzimidazoles, and its mechanism has been examined. Spectroscopic