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.
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.
Palladium-Catalyzed C2-Acylation of Indoles with α-Diketones Assisted by the Removable<i>N</i>-(2-Pyrimidyl) Group
作者:Chunpu Li、Wei Zhu、Shuangjie Shu、Xiaoming Wu、Hong Liu
DOI:10.1002/ejoc.201500304
日期:2015.6
An effective and practical palladium-catalyzedC2-acylation method was successfully developed for the synthesis of 2-acylindoles. A variety of 2-acylindoles were readily prepared from N-pyrimidyl indoles in moderate to good yields. This methodology offers several advantages, which include ease of handling, mild reaction conditions, and use of an efficient and cheap catalyst. In particular, challenging