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Paper | Regular issue | Vol 48, No. 9, 1998, pp.1879-1885
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8222
Synthesis and Transformations of 2-Amino-1-(4,5-Dihydro-1H-imidazol-2-yl)benzimidazoles. A Route to 2,3-Dihydrobenzo[4,5]imidazo[1,2-c]imidazo[1,2-a][1,3,5]triazine Ring System

Franciszek Saczewski,* Tomasz Debowski, and Jacek Szmigiel

*Department of Organic Chemistry, Medical University of Gdansk, Al. Gen. Hallera 107, 80-416 Gdansk, Poland


Starting from 3-(4,5-dihydro-1H-imidazol-2-yl)-2-oxo-2,3-dihydrobenzimidazole-1-carbonitriles (1a-e) and the 2-amino-1-(4,5-dihydro-1H-imidazol-2-yl)benzimidazoles (2a-e) and 1-(4,5-dihydro-1H-imidazol-2-yl)-2-oxo-2,3-dihydrobenzimidazoles (3a-e) have been synthesized. Cyclocondensation of 2a with acetic anhydride or acyl chlorides gave novel functionalized 2,3-dihydrobenzo[4,5]imidazo[1,2-c]imidazo[1,2-a]triazines (4a-d).