Convenient synthesis of 8-substituted 9H-dipyrido[3,2-b:3',2'-d]pyrrole (6-aza-δ-carbolines)

Article abstract of DOI:10.1055/s-1997-1499

6-Aza-δ-carbolines have been readily obtained in three steps from 7-azaindolinone (1,2-dihydro-3H-pyrrolo[2,3-b]pyridin-3-one), by aldol condensation, inverse electron demand Diels-Alder reactions and treatment with hydroxylamine hydrochloride.