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Highly efficient solvent-free synthesis of pyranopyrazoles by a Brønsted-acidic ionic liquid as a green and reusable catalyst.
- Source :
-
Journal of Chemical Sciences . Sep2012, Vol. 124 Issue 5, p1013-1017. 5p. - Publication Year :
- 2012
-
Abstract
- A simple, green and efficient protocol for synthesis of dihydropyrano[2,3-c]pyrazole derivatives is developed by a four component reaction of various benzaldehydes, ethyl acetoacetate, hydrazine hydrate and malononitrile in the presence of 3-methyl-1-(4-sulphonic acid)butylimidazolium hydrogen sulphate [(CH)SOHMIM][HSO], an acidic ionic liquid and as a catalyst, under solvent-free conditions. The key advantages of this process are high yields, shorter reaction times, easy work-up, purification of products by non-chromatographic method and the reusability of the catalyst. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09743626
- Volume :
- 124
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 82672341
- Full Text :
- https://doi.org/10.1007/s12039-012-0310-9