Assembly of spirocyclic pyrazolone-pyrrolo[4,3,2-de]quinoline skeleton via cascade [1,5] hydride transfer/cyclization by C(sp3)–H functionalization

An efficient, scalable cascade [1,5] hydride transfer/cyclization approach for the construction of spirocyclic pyrazolone-pyrrolo[4,3,2- de ]quinoline skeletons through C(sp 3 )–H functionalization.