Merger of Visible-Light Photoredox Catalysis and C–H Activation for the Room-Temperature C-2 Acylation of Indoles in Batch and Flow
作者:Upendra K. Sharma、Hannes P. L. Gemoets、Felix Schröder、Timothy Noël、Erik V. Van der Eycken
DOI:10.1021/acscatal.7b00840
日期:2017.6.2
and versatile protocol for the C–H acylation of indoles via dual photoredox/transition-metal catalysis was established in batch and flow. The C–H bond functionalization occurred selectively at the C-2 position of N-pyrimidylindoles. This room-temperature protocol tolerated a wide range of functional groups and allowed for the synthesis of a diverse set of acylated indoles. Various aromatic as well as
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.
A palladium-catalyzedC2-acylation of indoles with aryl and alkyl aldehydes via C–H functionalization is reported. The method shows excellent functional group tolerance and provides a straightforward way for the preparation of 2-aroylindoles.
Synthesis of 2-Acylated Indoles through Palladium-Catalyzed Dehydrogenative Coupling of N-Pyrimidine-Protected Indoles with Aldehydes and Ethyl Glyoxylate
作者:Ze Tan、Wenduo Wang、Jidan Liu、Qingwen Gui
DOI:10.1055/s-0034-1379935
日期:——
C2-Acylated indoles have been synthesized in good yields through palladium-catalyzed dehydrogenative coupling of N -pyrimidine-protected indoles using aldehydes as the source of acyl reagent and tert -butyl hydroperoxide as the oxidant. 2-Indole carboxylates can be synthesized when aldehydes are substituted by ethyl glyoxylate.
Direct C-2 acylation of indoles with toluene derivatives via Pd(<scp>ii</scp>)-catalyzed C–H activation
作者:Yaping Zhao、Upendra K. Sharma、Felix Schrӧder、Nandini Sharma、Gonghua Song、Erik V. Van der Eycken
DOI:10.1039/c7ra06004a
日期:——
A simple and efficient Pd-catalyzed method for the C2-acylation of indoles is described. Less toxic, stable, and commercially available toluene derivatives were used as acyl sources, with tert-butylhydroperoxide (TBHP) as oxidant and pivalic acid as additive, providing moderate to good yields.