Dual visible-light photoredox and palladium(<scp>ii</scp>) catalysis for dehydrogenative C2-acylation of indoles at room temperature
作者:Manash Kumar Manna、Gurupada Bairy、Ranjan Jana
DOI:10.1039/c7ob01418j
日期:——
A highly regioselective direct C2-acylation of N-pyrimidine protected indoles with aldehydes is reported at roomtemperature through the merger of visible light photoredox and palladium(II) catalysis. Late-stage acylation of tryptophan, selective mono-acylation of carbazole and the syntheses of tubulin inhibitors D-64131 and D-68144 are also demonstrated.
A palladium-catalyzed decarboxylative C2-acylation of indoles with α-oxocarboxylic acids was achieved. This protocol represents a novel and complementary approach to 2-aroylindoles.
The nickel-catalyzed decarbonylation of unstrained diaryl ketones has been developed. The reaction is catalyzed by a combination of Ni(cod)2 and an electron-rich N-heterocyclic carbene ligand. High functional group tolerance and excellent yields (up to 98%) are observed. This strategy provides an alternative and versatile approach to construct biaryls using an inexpensive nickel catalyst.