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Synthesis of New Pyrazolo[1,5- α ]quinazoline Derivatives.
- Source :
- Synthetic Communications; 2015, Vol. 45 Issue 14, p1675-1680, 6p, 5 Diagrams, 2 Charts
- Publication Year :
- 2015
-
Abstract
- The reaction of various anthranilic acid derivatives or their esters with 4-oxotetrahydrothiophene-3-carbonitrile 2, 2-oxocyclopentanecarbonitrile (9, n = 1) or 2-oxocyclohexanecarbonitrile (9, n = 2) in ethanol under reflux conditions giving rise the formation of single products isolated in each case after simple filtration. The products were characterized as pyrazolo[1,5-a]quinazolin-5-ones4instead of the expected pyrazol-3-amines3. These cascade condensation–intramolecular acylation processes generated in one-step reactions from simple starting materials novel heterocyclic scaffolds ready for further functionalization. The present synthetic protocol provides acceptable yields of new tetracyclic products in high purity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00397911
- Volume :
- 45
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- Synthetic Communications
- Publication Type :
- Academic Journal
- Accession number :
- 103167783
- Full Text :
- https://doi.org/10.1080/00397911.2015.1040511