E. Erba, G. Mai, D. Pocar
1992
Citations
0
Influential Citations
13
Citations
Journal
Journal of The Chemical Society-perkin Transactions 1
Abstract
5-Amino-1-(2-nitroaryl)-1,2,3-triazolines 5 are converted into 1-alkyl-2-aminobenzimidazoles 7 in refluxing triethyl phosphite. The reaction occurs via thermal rearrangement of 5 followed by nitrogen elimination which produces N2-(2-nitroaryl)amidines 6 as intermediates. Reduction of the nitro group to nitrene, addition to the CN bond and rearrangement of the intermediate 2,2-disubstituted benzimidazoles accounts for the formation of the end products.