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Some new derivatives of substituted-4(3H)-quinazolinones were synthesized and evaluated for their in vitro antitumor and antimicrobial activities. The results of this study demonstrated that compound 5 yielded selective activities toward NSC Lung Cancer EKVX cell line, Colon Cancer HCT-15 cell line and Breast Cancer MDA-MB-231/ATCC cell line, while NSC Lung Cancer EKVX cell line and CNS Cancer SF-295 cell line were sensitive to compound 8. Additionally, compounds 12 and 13 showed moderate effectiveness toward numerous cell lines belonging to different tumor subpanels. On the other hand, the results of antimicrobial screening revealed that compounds 1, 9 and 14 are the most active against Staphylococcus aureus ATCC 29213 with minimum inhibitory concentration (MIC) of 16, 32 and 32 mg/mL respectively, while compound 14 possessed antimicrobial activities against all tested strains with the lowest MIC compared with other tested compounds. In silico study, ADME-Tox prediction and molecular docking methodology were used to study the antitumor activity and to identify the structural features required for antitumor activity.

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A new series of quinazolin-4(3H)-one derivatives containing either a thiazole or College of Pharmacy, a 1,3,4-thiadiazole moiety were prepared in order to study the effect of such a Mansoura University, heterocyclic combination on the expected diuretic activity. Synthesis of the target Mansoura 35516, Egypt compounds (2, 4, and 6) has been achieved through an interaction of the b Pharmaceutical Organic starting 7-chloro-2-methyl-4H-3,1-benzoxazin-4-one 1 with different heterocyclic Chemistry Departments, amines. Alkylation of 3-(2-mercapto-1,3,4-thiadiazol-5-yl)quinazolin-4(3H)-one College of Pharmacy, derivative 4 with different alkyl halides or chloroacetic acid afforded the correMansoura University, sponding thioethers 5 while interaction of 2-methyl-3-(1,3,4-thiadiazol-5-yl or thiMansoura 35516, Egypt azol-5-yl)quinazolin-4(3H)-ones (2 and 6) with various aromatic aldehydes resulted in the formation of the arylvinyl analogs 3 and 7, respectively. On the other hand, 2-morpholinomethyl-3-(2-sulfamoyl or mercapto-1,3,4Ϫthiadiazol-5-yl)quinazolin-4(3H)-one derivatives 10 have also been synthesized through an interaction of the sulfonamide or thiol analog 9 with the appropriate amine. Biological evaluation of some of the target compounds as diuretic agents was carried out. The results showed that 2-[2-(4-chlorophenyl)vinyl]-7-chloro-3-(2-sulfamoyl-1,3,4-thiadiazol-5-yl)quinazolin-4(3H)-one 7b exhibited significant diuretic activity. The detailed synthesis, spectroscopic and biological data are reported.

Synthesis of some new derivatives of 2-aryl-4-oxo-1-(4-quinazolyl)quinazolines is described. Methyl N-(4-quinazolyl)anthranilate was allowed to react with phenyl iso(thio)cyanate to give 3-phenyl-1-(4-quinazolyl)-1, 2, 3, 4-tetrahydro-2, 4-dioxo- and 4-oxo-2-thioxoquinazolines (3a and 3b respectively) Alternatively, anthranilic acid amide derivatives were subjected to cyclization with aromatic aldehydes to give 2-aryl-4-oxo-1-(4-quinazolyl)-1, 2, 3, 4-tetrahydroquinazolines 5. On the other hand, 2-chloro-4-(4-substituted 1-piperazinyl)quinazoline derivatives were subjected to the same type of reactions at the 2-position to afford the corresponding quinazoline derivatives 8 and 10 respectively. Furthermore, the acid amide 4b cyclized with acid chlorides to give the corresponding 2-aryl-1-(2-chloro-4-quinazolyl)-4-oxo-1, 4-dihydroquinazolines 11 from which the triazoloquinazoline derivatives 13 and 15 were synthesized through the intermediate hydrazine derivatives 12. Most of the newly synthesized compounds were tested for their antiinflammatory activities. However, some of the novel compounds were found to exhibit good antiinflammatory potencies.