Zn2+-K10-clay (clayzic) as an efficient water-tolerant, solid acid catalyst for the synthesis of benzimidazoles and quinoxalines at room temperature

Tetrahedron Letters

Volumn 52, Issue 1, 2011, Pages 69-73

  Dhakshinamoorthy, Amarajothi ^a   Kanagaraj, Kuppusamy ^a   Pitchumani, Kasi ^a  

^a MADURAI KAMARAJ UNIVERSITY   (India)

Author keywords

Benzimidazoles; Clayzic; K10 Montmorillonite; Lewis acids; Quinoxalines

Indexed keywords

BENZIMIDAZOLE DERIVATIVE; CLAYZIC; LEWIS ACID; MONTMORILLONITE; PHENYLENEDIAMINE; QUINOXALINE DERIVATIVE; SCHIFF BASE; UNCLASSIFIED DRUG; ZINC CHLORIDE;

AQUEOUS SOLUTION; ARTICLE; CATALYST; DRUG SYNTHESIS; GREEN CHEMISTRY; REACTION OPTIMIZATION; ROOM TEMPERATURE;

EID: 78649875006     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2010.10.146     Document Type: Article

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36. General procedure for the synthesis of benzimidazoles/quinoxalines: In a typical reaction, aldehyde/carbonyl compounds (0.9 mmol) and o-phenylenediamine (0.9 mmol) were dissolved in 3 mL of water-methanol/acetonitrile mixture (1:1 v/v). To this solution, clayzic (100 mg) was added and stirred for the required time at room temperature. Then the reaction mixture was extracted with dichloromethane (10 mL), filtered, washed with water, and dried with anhydrous sodium sulfate. In some cases, crude products were recrystallized with ethyl acetate.