24107-50-4Relevant academic research and scientific papers
Rhodium catalyzed 2-alkyl-benzimidazoles synthesis from benzene-1,2-diamines and tertiary alkylamines as alkylating agents
Yamini,Sharma, Saurabh,Das, Pralay
, (2021/05/17)
Substituted 2-alkyl-benzimidazoles were synthesized from benzene-1,2-diamine and tertiary amines as alkylating agent under polystyrene supported rhodium (Rh@PS) nanoparticles (NPs) catalyzed conditions. The heterogeneous rhodium catalyst was applied first time for the synthesis of 2-alkyl-benzimidazoles. The reaction followed through oxidation of alkylamines, transamination, and oxidative cyclisation with benzene-1,2-diamines for the corresponding products synthesis with good yields. The process is applicable for vast substrate scope, several functional groups are tolerable, and the Rh@PS catalyst is recyclable up to four cycles without significant loss in catalytic activity.
Radical C?H Acylation of Nitrogen Heterocycles Induced by an Aerobic Oxidation of Aldehydes
Paul, Subhasis,Bhakat, Manotosh,Guin, Joyram
supporting information, p. 3154 - 3160 (2019/08/30)
An aerobic radical approach for the synthesis of unsymmetrical heteroaryl ketones is described herein. The reaction involves cross-dehydrogenative coupling between aldehydes and heteroaromatic bases with molecular oxygen (O2). The key aspect of the method is the generation of reactive acyl radical via homolytic activation of aldehyde C?H bond using O2 as the sole oxidant. The reaction has a good substrate scope with respect to aldehydes and functionalized nitrogen heterocycles. Based on our mechanistic studies, a radical chain pathway is suggested for the reaction. A synthetic application of the method is demonstrated in the formal synthesis of natural alkaloid (±) angustureine.
An easy one-step photocatalytic synthesis of 1-aryl-2-alkylbenzimidazoles by platinum loaded TiO2 nanoparticles under UV and solar light
Selvam,Swaminathan
experimental part, p. 3386 - 3392 (2011/06/28)
One-pot synthesis 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 photocatalytic reaction, condensation and catalytic dehydrogenation on Pt-TiO2. In case of diamines, this reaction is proceeded by Pt-TiO2 assisted photocatalytic oxidation of an alcohol and a catalytic dehydrogenation of the intermediate on the surface of platinum nanoparticles. In both cases product formation was achieved by tandem photocatalytic and catalytic reactions on Pt-TiO2.
ORGANOLITHIUM AND ORGANOSODIUM COMPOUNDS OF N-SUBSTITUTED 2-ALKYLBENZIMIDAZOLES
Tertov, B.A.,Bogachev, Yu.G.,Koshchienko, Yu.V.,Suvorova, G.M.,Tsupak, E.B.,et al.
, p. 868 - 872 (2007/10/02)
Organolithium and organosodium compounds of 1,2-dimethyl-, 1-methyl-2-ethyl-,1-methyl-2-propyl-, and 1-phenyl-2-methylbenzimidazole, containing the metal in the alkyl group at position C(2), were obtaind by metallation.It was found that metallation can be complicated by the addition of metalling reagent at the C=N bond of the heterocycle.It was shown that the obtained organometallic compounds can be used for the synthesis of various derivatives of benzimidazole.
