derivatives from azobenzenes and tertiary amines. The reaction involves rearrangement of the azobenzene moiety to an N-phenyl-1,2-phenylenediamine intermediate which then undergoes alkylation at nitrogen with an alkyl group from the tertiary amine followed by ring closure and aromatization. Various ruthenium complexes serve as catalyst precursors for the reaction and the presence of carbonmonoxide is required
Verfahren zur Herstellung von substituierten Benzimidazolen
申请人:CIBA-GEIGY AG
公开号:EP0138750A1
公开(公告)日:1985-04-24
Die Ruthenium- oder Rhodium katalysierte Reaktion von Azobenzolen mit tertiären Aminen, die mindestens eine RCH2-Gruppe aufweisen, oder die Rutheniumkatalysierte Reaktion mit primären Alkoholen bzw. deren Ester aliphatischer Carbonsäuren, führt zu 1-Phenyl-2-substituierten Benzimidazolen.
An easy one-step photocatalytic synthesis of 1-aryl-2-alkylbenzimidazoles by platinum loaded TiO2 nanoparticles under UV and solar light
作者:K. Selvam、M. Swaminathan
DOI:10.1016/j.tetlet.2011.04.090
日期:2011.6
One-potsynthesis of disubstituted benzimidazoles from N-substituted 2-nitroanilines or 1,2-diamines with 3–12 nm-sized platinum particles loaded on the TiO2 using solar and UV-A light is described. 1-Aryl-2-alkylbenzimidazoles from 2-nitrodiphenylamines are formed by combined redox photocatalyticreaction, condensation and catalytic dehydrogenation on Pt-TiO2. In case of diamines, this reaction is