1,3-Bis(pyridin-2-ylthio)propan-2-ones, bis(thieno[2,3-b]pyridine-2-yl)ketones and 5H-bispyrido[3',2':4,5]thieno[2,3-b:2',3'-e]pyridin-11-ones

Article abstract of DOI:10.1002/ardp.19933261209

Reaction of 1a-d with 1,3-dichloroacetone gives the bissulphides 2a-d. Base catalyzed cyclization of 2a-d affords heterocyclically substituted ketones 3a-e. Treatment of 3a and 3b in conc. H₃PO₄ leads to the bispyridothienopyridines