Year 2007, Month 6 (Section Full Articles, Page 1216)
Hydrogenation on palladium-containing granulated catalysts 3.* Synthesis of aminobenzimidazoles
by catalytic hydrogenation of dinitroanilines
V. V. Elkin, L. N. Tolkacheva, N. B. Chernysheva, I. B. Karmanova, L. D. Konyushkin, and V. V. Semenov
Efficient hydrogenation of o-aminonitrobenzenes on palladium-containing granulated carbon catalysts in carboxylic acid solutions was accompanied by cyclization into aminobenzimidazoles. A simple hydrogenation reactor with a fixed gauze holding a reusable granulated catalyst was designed. Acylated and sulfonylated 4(7)-aminobenzimidazoles were obtained. In terms of electronic and geometrical parameters, they are close analogs of biologically active imidazo[1,5,4-e, f ][1,5]benzodiazepines.
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