Conanoparticles (NPs) encapsulated in N‐dopedcarbonnanotubes (Co@NC900) are systematically investigated as a potential alternative to precious Pt‐group catalysts for hydrogenative heterocyclization reactions. Co@NC900 can efficiently catalyze hydrogenative coupling of 2‐nitroaniline to benzaldehyde for synthesis of 2‐phenyl‐1H‐benzo[d]imidazole with >99 % yield at ambient temperature in one step
Indium-mediated one-pot benzimidazole synthesis from 2-nitroanilines or 1,2-dinitroarenes with orthoesters
作者:Jaeho Kim、Jihye Kim、Hyunseung Lee、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tet.2011.08.017
日期:2011.10
One-pot reduction-triggered heterocyclizations from 2-nitroanilines or 1,2-dinitroarenes to benzimidazoles were investigated in this study. In the presence of indium/AcOH in ethyl acetate at reflux, reaction of 2-nitroanilines or 1,2-dinitroarenes with R–C(OMe)3 (R=Me, Ph) produced excellent yields of the corresponding benzimidazoles within 30 min to 6 h depending on the substituents of the starting
1,2 diarylbenzimdazoles and their pharmaceutical use
申请人:Schering AG
公开号:US20020006948A1
公开(公告)日:2002-01-17
Benzimidazoles of general formula I
1
and the use of benzimidazole derivatives for the production of pharmaceutical agents for treatment and prophylaxis of diseases that are associated with a microglia activation are described.
Nickel catalyzed sustainable synthesis of benzazoles and purines <i>via</i> acceptorless dehydrogenative coupling and borrowing hydrogen approach
作者:Gargi Chakraborty、Rakesh Mondal、Amit Kumar Guin、Nanda D. Paul
DOI:10.1039/d1ob01154e
日期:——
benzoxazole via acceptorless dehydrogenative functionalization of alcohols. Using a bench stable, easy to prepare, and inexpensive Ni(II)-catalyst, [Ni(MeTAA)] (1a), featuring a tetraaza macrocyclic ligand (tetramethyltetraaza[14]annulene (MeTAA)), a wide variety of polysubstituted benzimidazole, purine, benzothiazole, and benzoxazole derivatives were prepared via dehydrogenative coupling of alcohols with
Additive- and Oxidant-Free Expedient Synthesis of Benzimidazoles Catalyzed by Cobalt Nanocomposites on N-Doped Carbon
作者:Zhaozhan Wang、Tao Song、Yong Yang
DOI:10.1055/s-0037-1610353
日期:2019.2
phenylenediamines and aldehydes catalyzed by a highly recyclable nonnoble cobalt nanocomposite was developed. A broad set of benzimidazoles can be efficiently synthesized in high yields and with good functional-group tolerance under additive- and oxidant-free mildconditions. The catalyst can be easily recycled for successive uses, and the process permits gram-scale syntheses of benzimidazoles.