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
Synthesis of N-aryl-1-aminoindoles via intermolecular redox amination
作者:Kinthada Ramakumar、Jon A. Tunge
DOI:10.1039/c4cc06369d
日期:——
A redox amination strategy was developed for the synthesis of N-aryl-1-aminoindoles by N–N bond formation. Reaction of nitrosobenzenes with readily available indolines using Brønsted acid catalysis allows N–N bond formation under mild conditions. This method exploits the inherent reducing power of indoline to synthesize biologically relevant molecular architectures via redox amination. A one-pot synthesis of 1-aminoindoles starting from simple aniline and indolines is likewise described.
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.