An eco-friendly one-pot synthesis of 4,4'-(arylmethylene)bis(1h-pyrazol-5-ols) using [et3nh][hso4] as a recyclable catalyst

• ZHONGQIANG ZHOU ^[1] ; YULIANG ZHANG ^[1]
  1. [1] South-Central University for Nationalities College of Chemistry and Materials Science
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 60, Nº. 3, 2015, págs. 2992-2996
• Idioma: inglés
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• Resumen

  • A simple and efficient procedure for synthesis of 4,4'-(arylmethylene)bis(1H-pyrazol-5-ols) by one-pot three-component condensation of aromatic aldehydes, ethyl acetoacetate, and phenylhydrazine/hydrazine hydrate under solvent-free conditions in the presence of [Et3NH][HSO4] as catalyst is described. The present protocol offers several advantages such as using a reusable and cost-effective ionic liquid, high yields, simple procedure, easy work-up and eco-friendly reaction conditions.