Abstract
A method is presented for the synthesis of 4-(substituted phenyl)-3-(3-substituted phenyl)4H-spiro[isoxazole-5,3′-pyrido[1,2-a]pyrimidine]-2′,4′-dione (3), 3-(4-substituted phenyl)-3H-isoxazole[3, 4-d]pyrido[1,2-a]pyrimidin-4-(3aH)-one (4) and 3-(4-substituted phenyl) 3,3a-dihydropyrazolo[3,4-d]pyrido[1,2-a]pyrimidin-4-(2H)-one (5) which consists of the conversion of 2H-pyrido[1,2-a]pyrimidine-2,4(3H)-dione (1) to chalcones (2) and their 1,3-dipolar cycloaddition with appropriate aldoximes to give spiro compounds and heterocyclization using amines to yield isoxazolines and pyrazolines. All the compounds were screened for their antimicrobial and antitubercular activity.
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The authors express their sincere thanks to the Head, Department of Chemistry, Lucknow University, Lucknow, for providing laboratory facilities. They are also thankful to the Director, Central Drug Research Institute, Lucknow for elemental analysis, spectral data and biological activity studies.
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BISHNOI, A., SINGH, S., TIWARI, A.K. et al. Synthesis, characterization and biological activity of new cyclization products of 3-(4-substituted benzylidene)-2H-pyrido[1,2-a]pyrimidine 2,4-(3H)-diones. J Chem Sci 125, 305–312 (2013). https://doi.org/10.1007/s12039-013-0367-0
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DOI: https://doi.org/10.1007/s12039-013-0367-0