On June 30, 2006, Yutilov, Yu. M.; Smolyar, N. N.; Lomov, D. A. published an article.Reference of 3-Phenyl-1H-imidazo[4,5-b]pyridin-2(3H)-one The title of the article was Synthesis of 1- and 3-substituted imidazo[4,5-b]pyridin-2-ones. And the article contained the following:
1- And 3-Substituted imidazo[4,5-b]pyridin-2-ones were synthesized by heating equimolar amounts of 3-amino-2-chloropyridine or 2-chloro-3-methylaminopyridine, urea, and the corresponding arylamine at 150-210°. The reaction of 3-amino-2-chloropyridine with urea and p-phenylenediamine or p,p’-diaminobiphenyl at a ratio of 2:2:1 under analogous conditions gave 1,4-bis-(2-oxoimidazo[4,5-b]pyridin-3-yl)benzene or 1,4-bis(2-oxoimidazo[4,5-b]pyridin-3-yl)biphenyl, resp. The experimental process involved the reaction of 3-Phenyl-1H-imidazo[4,5-b]pyridin-2(3H)-one(cas: 41010-50-8).Reference of 3-Phenyl-1H-imidazo[4,5-b]pyridin-2(3H)-one
The Article related to cyclization aminochloropyridine urea arylamine preparation imidazopyridinone, Heterocyclic Compounds (More Than One Hetero Atom): Imidazoles and other aspects.Reference of 3-Phenyl-1H-imidazo[4,5-b]pyridin-2(3H)-one
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem