Wahe H.; Asobo P.; Cherkasov R.; Nkengfack A.; Folefoc G.; Fomum Z.; Doepp D.
(2003)
2-Aminobenzimidazole (1a) and its 5,6-dimethyl derivative 1b react with phenylpropynenitrile (2) to give 2-amino-4-phenylpyrimido[1,2-a]benzimidazoles 8a,b in excellent yields. Of these compounds, 2-amino-7,8-dimethyl-4- ...