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.
Palladium-Catalyzed Cross-Coupling of 1-Aminoazoles with Aryl Chlorides: Application to the Synthesis of Unsymmetrical<i>N,N′</i>-Diaryl-1-aminoindoles
This process based on the use of tris(dibenzylideneacetone)dipalladium associated to Xphos as the catalyst system is general, and allows the coupling to proceed, for the first time, with a variety of cheaper and less reactive aryl chlorides. The sequential combination of selective monoarylation using aryl chlorides and a second N-arylation reaction using (hetero)aryl bromides and iodides proved to be
Palladium-catalyzed selective N-(hetero)arylation or N,N′-di(hetero)arylation of 1-aminoindoles
作者:Samir Messaoudi、Jean-Daniel Brion、Mouâd Alami
DOI:10.1016/j.tetlet.2011.03.068
日期:2011.5
The selective synthesis of N-(hetero)aryl-1-aminoindoles 3 from the corresponding N-aminoindoles and (hetero)aryl halides using a catalyst combination of Pd2(dba)3 associated to Josiphos is described. By switching to Xantphos as the ligand, the alternate catalytic system allows the coupling to proceed efficiently for the preparation of symmetrical and unsymmetrical N,N′-diaryl-1-aminoindole derivatives
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.