Current Issue : January - March Volume : 2014 Issue Number : 1 Articles : 6 Articles
Novel 3-substituted-1-aryl-5-phenyl-6-anilino-pyrazolo[3,4-d]pyrimidin-4-one derivatives with anti-inflammatory\r\nactivity were subjected for the two and three dimensional quantitative structure activity relationships (2D-QSAR and 3D-QSAR)\r\nstudies using Vlife MDS 4.0 drug design module with various combinations of thermodynamic, electronic and spatial descriptors.\r\nThe 2D-QSAR models multiple regression as well as principle component regression approach and 3D-QSAR model using the k\r\nnearest neighbour (kNN) approach were developed. The best 2D-QSAR model (r2 = 0.94, Fisher test value F = 22.09, r2 se = 0.06)\r\nhas acceptable statistical quality and predictive potential as indicated by the value of cross validated squared correlation\r\ncoefficient (q2= 0.76) by genetic algorithm multiple regression. The other 2D QSAR model (r2 = 0.70, F = 12.12, r2 se = 0.14, q2 =\r\n0.18) by stepwise forward-backward principle component regression has also acceptable statistical quality. The best 3D-QSAR\r\nmodel (q2 = 0.86, predr2 = 0.023, kNN= 2) was selected by k nearest neighbour method. From these models, it is seen that chiV1,\r\nH-donar count, chi V5 contribute positively and molecular weight contribute negatively for anti-inflammatory activity. Thus\r\nthese validated models bring important structural insight to aid the design of effective anti-inflammatory agent...
Some novel 2-aminopyrimidine derivatives 5a-j were synthesized by claisen-schmidt condensation of 3-acetyl-2,5-\r\ndimethylthiophene and different substituted aromatic aldehydes to give respective chalcones and further cyclised with\r\nguanidine in ethanol in reflux conditions to give respective 2-aminpyrimidines 5a-j. All the synthesized compounds were\r\ncharacterized by physical and spectral data. The compounds were screened for anti-microbial activities. Compounds 5g and 5e\r\nwere found to possess significant anti bacterial activity against both gram positive and gram negative bacteria at the tested\r\nconcentrations when compared with that of standard drug ampicillin. In anti-fungal study, compounds 5h, 5f and 5g have\r\nexhibited significant anti fungal activity when compared with standard drug fluconazole. These compounds can be further\r\nexploited to get the potent lead compound....
In this present study hydrazone derivative of 5-chloro-2-acetylbenzofuran was condensed with different substituted\r\naromatic aldehydes to form respective schiff bases (5a-h) then cyclised with chloroacetylchloride in presence of triethylamine to\r\nyield the corresponding 2-azetidinones (6a-h). Structures of synthesized compounds are confirmed by physical and spectral\r\nanalysis. The synthesized 2-azetidinones (6a-h) were evaluated for their antimicrobial activity against Staphylococcus aureus\r\n(NCIM-2079), Bacillus subtilis (NCIM-2063), Escherichia coli (NCIM-2068), Proteus vulgaris (NCIM-2027), Aspergillus niger\r\n(ATCC-6275) and Candida tropicalis (ATCC-1369) using ampicillin and fluconzazole as standard drugs. All the compounds have\r\nshown moderate antimicrobial activities....
Various 2- Stryl benzimidazole derivatives were synthesized by treating OPD with Acetic acid and aryl aldehydes using H2SO4 as catalyst. All compounds were evaluated by physical and spectral analysis. The approach provides an attractive and simple method using solvent system. The captivating aspects of this method are producing selective achievement of desired product at optimum yield. The compounds were screened for their antibacterial activity and antifungal activity....
The title compounds 4-[4-(1,3-benzoxazol-2-yl)-3-phenyl-1H-pyrazol-1-yl]-7-methoxyquinoline derivatives 4a-i have\r\nbeen synthesized by the oxidation of respective schiffs bases 3a-i using iodobenzoxydiacetate (IBD) as a catalyst as well as\r\noxidizing agent. The use of catalyst is effective and acts as oxidant in the synthesis of target molecules. The formed products\r\nhave been characterized by IR, 1H NMR, 13C NMR and Mass spectral studies. The synthesized compounds have been screened for\r\nantimicrobial and antioxidant activities. The compound 4d and 4e showed potent antimicrobial and antioxidant activity when\r\ncompared with standard drugs, while other compounds exhibited moderate activities....
In the present investigation, new antimicrobial agents, arylimidazo [2,1-b] [1,3] thiazoles (3a-e) and imidazo [2,1-b] [1,3] benzothiazoles (5a-h), have been synthesized. The structure of newly synthesized compounds was characterized by NMR, mass spectral data and elemental analyses. The antimicrobial activity was carried out against various Gram-positive, Gram-negative bacteria and fungi. Some of the compounds exhibited moderate to good activity as compared to the standard drugs. Preliminary structure activity observations revealed that the presence of fluoro, chloro, cyano or nitro functional groups in the synthesized compounds enhanced the antimicrobial activity significantly compared to other substituents. Further, the synthesized compounds were screened for antioxidant (DPPH method) property and compounds 3a and 5a showed promising scavenging activity with DPPH free radicals....
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