Facile access to 6-substituted 1,4,5,7-tetrahydropyrrolo[3,4-b]-pyridines via Hantzsch type dimethyl 4-aryl-2-formyl-6-methyl-1,4-dihydropyridine-3,5-dicarboxylates

Article abstract of DOI:10.1002/jhet.5570370623

Efficient assembly of 6-substituted 4-aryl-5-oxo-1,4,5,7-tetrahydropyrrolo[3,4-b]pyridines (7a-f) is described according to a Hantzsch type reaction from formyl-ester 4 by imination, borohydride reduction and intramolecular thermal amino-ester cyclization