Ru(III)-catalyzed oxidative reaction in ionic liquid: an efficient and practical route to 2-substituted benzothiazoles and their hybrids with pyrimidine nucleoside
作者:Xuesen Fan、Yangyang Wang、Yan He、Xinying Zhang、Jianji Wang
DOI:10.1016/j.tetlet.2010.04.050
日期:2010.7
environmentally benign synthesis of 2-substituted benzothiazoles was developed through RuCl3-catalyzed oxidative condensation of 2-aminothiophenol with aldehyde in ionic liquid by using air as the oxidant. With this procedure, a series of 2-substituted benzothiazoles and benzothiazole/pyrimidine nucleoside hybrids with antimicrobial activities were efficiently prepared from easily accessible starting materials
Niobium-promoted reaction of α-phenylglyoxylic acid with ortho-functionalized anilines: synthesis of 2-arylbenzothiazoles and 3-aryl-2H-benzo[b][1,4]benzoxazin-2-ones
作者:Filipe Penteado、Marcelo M. Vieira、Gelson Perin、Diego Alves、Raquel G. Jacob、Claudio Santi、Eder J. Lenardão
DOI:10.1039/c6gc02495e
日期:——
A new and general method to prepare 2-arylbenzothiazoles and 3-aryl-2H-benzo[b][1,4]benzoxazin-2-ones by the reaction of -arylglyoxylic acid with o-aminothiophenol and o-aminophenol respectively is described. The use of ammonium niobium oxalate (ANO)...
This work reports a novel and efficient method for the synthesis of benzothiazoles using 2-aminothiophenolderivatives in conjunction with aromatic aldehyde as starting materials via visible-light-induced condensation cyclization. Utilizing fluorescein as the photocatalyst and blue LED lamp as the light source, the reaction proceeds in the presence of a molecular oxygen atmosphere without the need
The tetramethylammonium-hydroxide-catalyzed oxidative coupling of amines and alcohols has been described for the synthesis of several heterocycles under metal-free conditions by utilizing oxygen from air as the terminaloxidant.
the synthesis of quinazolinones, quinoxalinones, benzooxazinones, and benzothiazoles from the reactions of α-keto acids with 2-aminobenzamides, benzene-1,2-diamines, 2-aminophenols, and 2-aminobenzenethiols, respectively, is described. The reactions were conducted under catalyst-free conditions, using water as the sole solvent with no additive required, and successfully applied to the synthesis of sildenafil