A novel synthesis of 5H-dipyrido[1,2-a:2',3'-d]pyrimidin-5-ones is described. The method is based on Ullmann condensation of 2-chloronicotinic acid and its 5-bromo analoguewith 2-aminopyridine 1-oxides, followed by intramolecular cyclization of the resulting 3-carboxy-2,2'-bipyridylamine 1'-oxides with phosphorous.
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