Synthesis, Characterization and Antibacterial Evaluation of 2, 3Dihydroquinazolin-4 (1H)-Ones and Some New Bis 2, 3- Dihydroquinazolin-4 (1H)-Ones Using Pre-made Pyrazole Carbaldehyde Derivatives

Author(s): Kiana Faraji Sina, Asieh Yahyazadeh*, Nosrat Ollah Mahmoodi

Journal Name: Letters in Organic Chemistry

Volume 18 , Issue 3 , 2021


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Abstract:

2, 3-Dihydroquinazolinones are of popular compounds with the diversification of biological and pharmacological activities. Among many discovered methods, there are efficient and convenient methods used for the synthesis of 2, 3-dihydroquinazoline-4 (1H)-one and some new bis 2, 3- dihydroquinazoline-4 (1H)-one derivatives which are reported in this study. The mentioned methods include the two-component condensation of one molecule of anthranilamide and one molecule of pyrazole carbaldehyde using montmorillonite-K10 as a catalyst for the preparation of 2, 3 dihydroquinazoline- 4 (1H)-ones. Also, one-pot pseudo-five-component reaction (5MCRs) of two molecules of isatoic anhydride, two molecules of pyrazole carbaldehydes and one molecule of ethan-1, 2-diamine in the presence of the r catalyst (montmorillonite-K10) for the synthesis of bis 2, 3-dihydroquinazoline-4 (1H)-ones. Despite the short times of reactions, high yields of products were obtained, which were validated using FT-IR, 1HNMR, 13CNMR, and elemental analysis. Moreover, the compounds were screened for their antimicrobial activities against two-gram-positive bacterial strains: Staphylococcus aureus and Micrococcus Luteus; and against two-gram-negative bacterial strains, as well: Escherichia coli and Pseudomonas aeruginosa, which all were utilized for antibacterial investigations. The results showed moderate or significant antibacterial activities.

Keywords: 2, 3-Dihydroquinazolinone, bis 2, 3-dihydroquinazolinone, one-pot pseudo-five-component reaction (5MCRs), pyrazole carbaldehyde, montmorillonite-K10, antibacterial activity.

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Article Details

VOLUME: 18
ISSUE: 3
Year: 2021
Published on: 17 March, 2021
Page: [176 - 182]
Pages: 7
DOI: 10.2174/1570178617999200706010203
Price: $65

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