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Asian Journal of Research in Chemistry
Year : 2018, Volume : 11, Issue : 2
First page : ( 477) Last page : ( 484)
Print ISSN : 0974-4169. Online ISSN : 0974-4150.
Article DOI : 10.5958/0974-4150.2018.00087.1

Synthesis of Pyranopyrazoles by using Chitosan Hydrogel as a green and recyclable catalyst

Patil Kiran1,2,*, Helavi Vasant2

1Department of Chemistry, Dr. Ghali College, Gadhinglaj, Maharashtra, 416502, India

2Department of Chemistry, Rajaram College, Kolhapur, Maharashtra, 416004, India

*Corresponding Author E-mail: kiranpatil277@gmail.com

Online published on 2 June, 2018.

Abstract

Chitosan Hydrogel was used for a highly efficient one-pot, four component synthesis of 6-amino-3-methyl-5cyano-4-aryl-1, 4-dihydropyrano [2, 3-c] pyrazoles from aromatic aldehydes, malononitrile, ethyl acetoacetate and hydrazine hydrate in water as solvent under classical heating. Using microwave heating, reaction times were shortened from 1hr to 2 min. The advantages of this method includes the use of water as a green solvent, use of recyclable chitosan hydrogel as a green catalyst, short reaction time, easy work up, and excellent yields.

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Keywords

4-component reaction, One-pot synthesis, Chitosan hydrogel, Water, Microwave Irradiation.

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