Synthesis of Fused 1-Aminoindole Polycycles by a Sequence of Palladium-Catalyzed N–H and C(sp2)–H Arylations
摘要:
An efficient Pd-catalyzed selective intramolecular arylation of functionalized N,N'-substituted 1-aminoindoles has been reported. In all cases, the reactions take place rapidly in DMA and efficiently proceed in the presence of a Pd(OAc)(2)/Dpephos catalytic system, furnishing the fused indolo[2,1-a]phthalazines in high yields. Additionally, the one-pot double C-H arylation at positions C-2 and C-3 of N,N'-substituted 1-aminoindoles is effective and leads to unknown complex scaffolds of biological interest.