Knoevenagel Condensation Reaction Using Ionic Liquid [ADPQ][CF3SO3] as Green and Reusable Catalyst
作者:Xiaochong Gao、Can Gao、Ruichang Gao
DOI:10.14233/ajchem.2015.17821
日期:——
Knoevenagel condensation reaction of aromatic aldehydes with some active methylene compounds proceeded efficiently without solvent using ionic liquids as catalyst. The experimental results show that these ionic liquids have good catalytic activities to the Knoevenagel condensation with a wide range of reactant. The reactions are carried out in a few minutes with high yields. The ionic liquids can be recycled and reused for 4 times without noticeably decreasing the catalytic activity.
Synthesis of Novel Benzimidazolyl-substituted Acrylonitriles and Amidino-substituted Benzimidazo[1,2-a]Quinolines
作者:Marijana Hranjec、Grace Karminski-Zamola
DOI:10.3390/12081817
日期:——
A series of novel benzimidazole derivatives 3-10 were synthesized. Benzimidazolyl-substituted acrylonitriles 3 and 4 underwent a photochemical dehydrocyclization reaction to give the corresponding mono- and dicyano-substituted benzimidazo[1,2-a] quinolines 5 and 6. Pinner reaction of these compounds did not give the expected mono- and diamidines, but rather only compounds 7-10, with amido groups at 6-position were isolated. A mechanism for the reaction is proposed. Acyclic compounds 3 and 4, as well as cyclic benzimidazo[1,2-a]quinolines 5-8, exhibit interesting spectroscopic properties and are potential biologically active compounds.
Heterocyclic Fused Rings with Bridgehead Nitrogen Atoms: Single-Step Synthesis of Azolo[1″,2″:1′,2′]pyrido[5′,6′:5,4]pyrimido[1,6-a]benzimidazole; Pyrido[1,2-a]benzimidazole; Pyrido[4″,5″:2′,3′]pyrido[6′,5′:4,5]pyrimido-[1,6-a]benzimidazole and Polysubsti
作者:M. A. Raslan
DOI:10.1002/jccs.200000133
日期:2000.8
A one-step synthesis of the title compounds by the reaction of arylidene-lH-benzimidazol-2-ylacetonitriles 1a-d with 2-cyanomethylbenzimidazole derivatives 2a,b is reported.
Synthesis of polyazaheterocycles by Michael addition of CH acids to ?,?-unsaturated nitriles. Synthesis of pyrido[1,2-a]benzimidazole and pyrimido[5?,4?: 5,6]pyrido[1,2-a]benzimidazole derivatives
作者:Krystyna Bogdanowicz-Szwed、Agnieszka Czarny
DOI:10.1002/prac.19933350311
日期:——
Addition of 1H-benzimidazole-2-carbonitrile (1) to arylidenemalononitrile (2) gave 1-amino-3-aryl pyrido[1,2-a]benzimidazole-2,4-dicarbonitrile (3), 2-aryl-benzimidazole (4) and 1H-benzimidazole-2-acetonitrile, alpha-(arylmethylene) (5). Compounds (3) reacted with formamide yielding 4-amino-5-aryl pyrimido[5',4': 5,6]pyrido[1,2-a]benzimidazole (6).
REGAILA H. A. A.; EL-BAYOUKI KH.; HAMMAD M., EGYPT. J. CHEM., 1977 (1979), 20, NO 2, 157-166