Synthesis and anticonvulsant properties of a novel series of 2-substituted amino-5-aryl-1,3,4-oxadiazole derivatives
作者:A.-Mohsen M. E. Omar、Omaima M. Aboulwafa
DOI:10.1002/jhet.5570210538
日期:1984.9
A novel series of 2-substituted amino-5-aryl-1,3,4-oxadiazole derivatives were synthesized for their potential anticonvulsant activity. The synthesis involved the cyclodesulfurization of variously substituted salicylthiosemicarbazides with DCCD and mercuric oxide. Representative examples of the title compounds were also prepared by a one-pot cyclodesulfurization of mixtures of salicylhydrazides and
A series of 1,2,4-triazole-based compounds was designed as potential antibacterial agents using molecular hybridization approach. The target compounds (23-44) were synthesized by Mannich reaction of 1,2,4-triazole-3-thione derivatives with ciprofloxacin (CPX) and formaldehyde. Their potent antibacterial effect on Gram-positive bacteria was accompanied by similarly strong activity against Gram-negative strains. The toxicity of the CPX-triazole hybrids for bacterial cells was even up to 18930 times higher than the toxicity for human cells. The results of enzymatic studies showed that the antibacterial activity of the CPX-triazole hybrids is not dependent solely on the degree of their affinity to DNA gyrase and topoisomerase IV. (C) 2015 Elsevier Masson SAS. All rights reserved.
OMAR, A. -M. M. E.;ABOULWAFA, O. M., J. HETEROCYCL. CHEM., 1984, 21, N 5, 1415-1418
作者:OMAR, A. -M. M. E.、ABOULWAFA, O. M.
DOI:——
日期:——
<i>o</i>-Iodoxybenzoic Acid Mediated Oxidative Desulfurization Initiated Domino Reactions for Synthesis of Azoles
作者:Pramod S. Chaudhari、Sagar P. Pathare、Krishnacharaya G. Akamanchi
DOI:10.1021/jo2025509
日期:2012.4.20
A systematic exploration of thiophilic ability of o-iodoxybenzoic acid (IBX) for oxidative desulfurization to trigger domino reactions leading to new methodologies for synthesis of different azoles is described. A variety of highly substituted oxadiazoles, thiadiazoles, triazoles, and tetrazoles have been successfully synthesized in good to excellent yields, starting from readily accessible thiosemicarbazides, bis-diarylthiourea, 1,3-disubtituted thiourea, and thioamides.
Structure-activity Relationship Studies of Microbiologically Active Thiosemicarbazides Derived from Hydroxybenzoic Acid Hydrazides
of Gram‐negative species (Escherichia coli ATCC 25922, Klebsiella pneumoniae ATCC 13883, Proteus mirabilis ATCC 12453). The most potent antimicrobial activity was observed in the cases of salicylic acid hydrazide derivatives. The differences in activity inspired us to conduct conformational analysis using molecular mechanics level. The obtained results suggest that the molecule geometry, especially