A novel synthesis of di(1-methylazacycloalkeno)[2,3-b:2',3'-d]pyridines through annulation on lactam acetals

Article abstract of DOI:10.1016/S0040-4039(00)94353-3

Annulation reaction of lactam acetals 1a and b with primary amides provided a facile synthesis of di(1-methylazacycloalkeno)[2,3-b:2',3'-d]pyridines 6(a-i). Dehydrogenation of 6a,b,d formed dipyrrolo[2,3-b:2',3'-d]pyridines 7a,b,d.