Palladium-catalyzed intramolecular enantioselective β-arylation of tetrasubstituted endocyclic and exocyclic enamines is developed. A range of optically active medium-ring fused indolenines or 3,3′-spiroindolenines were achieved in enantiomeric ratios up to 98:2 with Cs2CO3 or K3PO4 as the base in the presence of chiral PHOX ligands. The use of Ag3PO4 as a base led to enantioenriched 1H-indoles in
开发了四取代的环内和环外烯胺的
钯催化的分子内对映选择性β-芳基化。在手性PHOX
配体的存在下,以Cs 2 CO 3或K 3 PO 4为碱,以对映体比例达到高达98:2的一系列旋光性中环稠合的
吲哚或3,3'-螺代
吲哚。以Ag 3 PO 4为碱,以(S)-DIFLUORPHOS为手性
配体,以良好的对映体比率(高达89:11)得到对映体富集的1H-
吲哚,这可能是通过可能的多米诺烯胺异构化/ β-芳基化序列。