Synthesis of Some Novel Bis[1, 2, 4]triazolo[3, 4-b][1, 3, 4]thiadiazine Derivatives for Antimicrobial Evaluation.

A new series of novel bis[1, 2, 4]triazolo[3, 4-b][1, 3, 4]thiadiazines 7a-j has been synthesized by the reaction of [5, 5'-methylenebis(3-methylbenzofuran-7, 5-diyl)]bis[(4-amino-5-thioxo-4, 5-dihydro-1H-1, 2, 4-triazol-3-yl)methanone] (6) with a variety of phenacyl bromides in ethanol under reflux for 6 h. All the newly synthesized compounds were tested for in vitro activity against certain strains of bacteria such as Escherichia coli, Klebsiella pneumoniae, Shigella dysenteriae and Shigella flexneri. Compounds 7a, 7c and 7g were highly active against the entire organism employed.

Synthesis of Novel Linked Pyrazolyl-thiazolidinone Heterocycles as Potent Antibacterial Agents.

A novel series of 2-(3, 5-dimethyl-1-phenyl-1H-4-pyrazolyl)-3-(aryl/heteroaryl)-1, 3-thiazolidin-4-one derivatives 4a-h has been synthesized readily in one-pot from 3, 5-dimethyl-1-phenyl-1H-4-pyrazolecarbaldehyde (3), and characterized via IR, NMR, MS and elemental analyses. Further, these compounds were screened for antibacterial (MIC) activity against Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Staphylococcus pyogenes. Amongst them, compounds containing pyridyl 4g and pyrimidinyl 4h moiety exerted superior antibacterial activity against S.

Synthesis and antimicrobial study of linked heterocyclics containing Pyrazole-pyrimidine-thiazolidin-4-one.

A new series of linked heterocyclics, 3-[4-(4-chlorophenyl)-6-(3,5-dimethyl-1-phenyl-1H-4-pyrazolyl)-2-pyrimidinyl]-2-(aryl/heteryl)-1,3-thiazolan-4-ones (6a-j), has been synthesized by the one-pot cyclo-condensation of 4-(4-chlorophenyl)-6-(3,5-dimethyl-1-phenyl-1H-4-pyrazolyl)-2-pyrimidinamine (5), aryl/heteroaryl aldehyde and thioglycolic acid. The structures of the synthesized compounds have been confirmed via IR, (1)H-NMR, (13)C-NMR, MS and elemental analyses. Further, all the newly synthesized compounds 6a-j have been assayed for their antimicrobial activity against Gram-positive and Gram-negative bacteria and fungi.

Synthesis and in vitro Study of Some New Bis(thiadiazolyl-2H-pyrazolo[3,4-d][1,3]thiazole)-methanes as Potential Nematicides.

A new series of bis(pyrazolo[3,4-d][1,3]thiazoles) 7a-j has been synthesized and characterized via IR, 1H NMR, 13C NMR, MS and elemental analyses. All the newly synthesized compounds 7a-j have been assayed for their nematicidal activity against Ditylenchus myceliophagus and Caenorhabditis elegans by aqueous in vitro screening technique. The screened data reveal that the compound 7e is most effective against D.

Synthesis of new 1,2,4-triazole[3,4-b][1,3,4]thiadiazoles bearing pyrazole as potent antimicrobial agents.

A new series of 6-(aryl/heteryl)-3-(5-methyl-1-phenyl-1H-4-pyrazolyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles (7a-j) has been synthesized by the reaction of 4-amino-5-(5-methyl-1-phenyl-1H-4-pyrazolyl)-4H-1,2,4-triazol-3-yl-hydrosulfide (6) with POCl(3) and the corresponding aryl/heteryl carboxylic acid, in ethanol at reflux temperature for 12 h. All the synthesized compounds were tested for in vitro activities against certain strains of bacteria such as Staphylococcus aureus, Bacillus subtilis, Escherichia coli and fungi such as Aspergillus niger, Aspergillus nodulans, Alternaria alternate. Compounds having 4-chlorophenyl (7d), 4-aminophenyl (7f), 4-nitrophenyl (7h) and 3-pyridyl (7i) substituents at 6-position of thiadiazole ring, showed marked inhibition of bacterial and fungal growth nearly equal to the standards.

Synthesis and Evaluation of Novel Bis[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles as Potent Antimicrobial Agents.

A series of novel bis[4-methoxy-3-(6-aryl[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol)phenyl]methanes 5a-l has been synthesized and characterized via IR, 1H NMR, 13C NMR, MS and elemental analyses. All the newly synthesized compounds were screened for their antibacterial activity against Bacillus subtilis, Bacillus sphaericu, Staphylococcus aureus, Pseudomonas aeruginosa, Klobsinella aerogenes and Chromobacterium violaceum and antifungal activity against Candida albicans, Aspergillus fumigatus, Trichophyton rubrum and Trichophyton mentagrophytes. Compounds 5e, 5f, 5h, 5i, 5k and 5l exhibited potent activity against the test bacteria and fungi, and emerged as potential molecules for further development.

Synthesis, nematicidal and antimicrobial activity of 3-(5-3-methyl-5-[(3-methyl-7-5-[2-(aryl)-4-oxo-1,3-thiazolan-3-yl]-1,3,4-thiadiazol-2-ylbenzo[b]furan-5-yl)methyl]benzo[b]furan-7-yl-1,3,4-thiadiazol-2-yl)-2-(aryl)-1,3-thiazolan-4-one.

A new series of 3-(5-3-methyl-5-[(3-methyl-7-5-[2-(aryl)-4-oxo-1,3-thiazolan-3-yl]-1,3,4-thiadiazol-2-ylbenzo[b]furan-5-yl)methyl]benzo[b]furan-7-yl-1,3,4-thiadiazol-2-yl)-2-(aryl)-1,3-thiazolan-4-one 5a-j has been synthesized by the reaction of N2-[(E)-1-(4-methylphenyl)methylidene]-5-(3-methyl-5-[3-methyl-7-(5-[(E)-1-(4-methylphenyl)methylidene]amino-1,3,4-thiadiazol-2-yl)benzo[b]furan-5-yl]methylbenzo[b]furan-7-yl)-1,3,4-thiadiazol-2-amine 4a-j with thioglycolic acid. Chemical structures of all the new compounds were established by their IR, 1H-NMR, 13C-NMR, MS and elemental data. The 5a-j have been assayed for their nematicidal activity against Ditylenchus myceliophagus and Caenorhabditis elegans by aqueous in vitro screening technique.

Synthesis and in vitro study of methylene-bis-tetrahydro[1,3]thiazolo[4,5-c]isoxazoles as potential nematicidal agents.

A series of methylene-bis-tetrahydro[1,3]thiazolo[4,5-c]isoxazoles 6 were synthesized by the reaction of chalcone derivative of methylene-bis-thiazolidinone 5 with hydroxylamine hydrochloride. The chemical structures of newly synthesized compounds were elucidated by IR, 1H, 13C NMR, MS and elemental analyses. The compounds 6a-g were evaluated for their nematicidal activity against Ditylenchus myceliophagus and Caenorhabditis elegans, compound 6e and 6f showed appreciable nematicidal activity.

Synthesis, nematicidal and antimicrobial properties of Bis-[4-methoxy-3-[3-(4-fluorophenyl)-6-(4-methylphenyl)-2(aryl)-tetrahydro-2H-pyrazolo[3,4-d]thiazol-5-yl]phenyl]methanes.

A new series of bis-[4-methoxy-3-[3-(4-fluorophenyl)-6-(4-methylphenyl)-2-(aryl)-3,3a,5,6-tetrahydro-2H-pyrazolo[3,4-d][1,3]thiazol-5-yl]phenyl]methanes 6a-r was synthesized by the reaction of arylidine derivative of methylene-bis-thiazolidinones 5a-c with aryl/alkyl hydrazines. Chemical structures of all the new compounds were established by IR, (1)H-NMR, (13)C-NMR, MS and elemental data. The compounds 6a-r were evaluated for their nematicidal activity against Ditylenchus myceliophagus and Caenorhabdites elegans by aqueous in vitro screening technique.