A. W. Chow, D. R. Jakas, B. Trotter
Feb 1, 1973
Citations
0
Influential Citations
28
Citations
Journal
Journal of Heterocyclic Chemistry
Abstract
2-Aminobenzimidazole reacts with α,β-unsaturated carboxylic acid chlorides or esters to give only pyrimido [1,2-a] benzimidazol-2-(1H) ones. β-Ethoxymethylenemalonie acid derivatives or β-ketocarboxylic acid derivatives give only pyrimido [1,2-a] benzimidazol-4-(1H)ones. Structural assignments based on nmr and chemical manipulations are discussed.