Selenium-Catalyzed Oxidative C(sp<sup>2</sup>)–H Amination of Alkenes Exemplified in the Expedient Synthesis of (Aza-)Indoles
作者:Stefan Ortgies、Alexander Breder
DOI:10.1021/acs.orglett.5b01156
日期:2015.6.5
A new selenium-catalyzed protocol for the direct, intramolecular amination of C(sp2)–H bonds using N-fluorobenzenesulfonimide as the terminal oxidant is reported. This method enables the facile formation of a broad range of diversely functionalizedindoles and azaindoles derived from easily accessible ortho-vinyl anilines and vinylated aminopyridines, respectively. The procedure exploits the pronounced
Synthesis of 3-aminopyridine-2-carboxaldehyde thiosemicarbazone (3-AP)
作者:Chuansheng Niu、Jun Li、Terrence W. Doyle、Shu-Hui Chen
DOI:10.1016/s0040-4020(98)00328-7
日期:1998.6
methylboronic acid with 2-chloro-3-nitropyridine produced 2-methyl-3-nitropyridine 4 in one step in high yield. Oxidation of 4 with selenium dioxide gave aldehyde 5. Alternatively, condensation of 4 with DMFDMA followed by oxidation gave 5 in a two step higher yielding conversion. Subsequent direct coupling of 5 with thiosemicarbazide followed by reduction of the nitro group using stannouschloride or sodium
Gold(<scp>i</scp>)-catalyzed synthesis of 2-substituted indoles from 2-alkynylnitroarenes with diboron as reductant
作者:Wenqiang Fu、Kai Yang、Jinglong Chen、Qiuling Song
DOI:10.1039/c7ob01918a
日期:——
An efficient method for the synthesis of 2-substitutedindoles via a diboron/base promoted tandem reductive cyclization of o-alkynylnitroarene under Au catalysis conditions has been disclosed. This reaction is efficient and convenient, affording 2-substitutedindoles with broad functional groups tolerance and excellent yields.