from the reaction of acid hydrazide 1 with alkyl or aryl isothiocyanate 2 in the presence of a KOH (10%) solution on the surface of silica gel as well as on the surface of montmorillonite K10 undermicrowaveirradiation. These triazoles have also been prepared from the reaction of 4-substituted-1-aroyl thiosemicarbazides 3a–e, with a KOH (10%) solution on the surface of silica gel undermicrowave irradiation
Design, synthesis, in vitro and in silico evaluation of novel substituted 1,2,4-triazole analogues as dual human VEGFR-2 and TB-InhA inhibitors
作者:Amira G. Zawal、Marwa M. Abdel-Aziz、Mahmoud H. Elbatreek、Abdalla A. El-Shanawani、Lobna M. Abdel-Aziz、Samar S. Elbaramawi
DOI:10.1016/j.bioorg.2023.106883
日期:2023.12
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The rapid preparation of 2-aminosulfonamide-1,3,4-oxadiazoles using polymer-supported reagents and microwave heating
作者:Ian R. Baxendale、Steven V. Ley、Marisa Martinelli
DOI:10.1016/j.tet.2005.03.062
日期:2005.5
Herein, we report on the preparation of a library of 5-substituted-2-amino-1,3,4-oxadiazoles and the corresponding thiadiazole analogues. Presented is a one-pot preparation of the 2-ammosulfonylated analogues through a three component coupling of an acylhydrazine, an isocyanate and sulfonyl chloride promoted by a polymer-supported phosphazine base under microwave dielectric heating. Also described is the optimization process and details pertaining to the elucidation of the reaction products. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of some 1,3,4-thiadiazole derivatives as inhibitors of Entamoeba histolytica
In the quest for potent anti-amoebic agents, some 1,3,4-thiadiazole derivatives were synthesized and characterized by spectral data. The purity of the compounds was confirmed by elemental analysis. All the compounds were screened in vitro against HM1:IMSS strain of Entamoeba histolytica by microdilution method. The results revealed that compounds 1 (IC50 = 0.670 mu M), 3 (IC50 = 1.60 mu M) and 8 (IC50 = 0.522 mu M) had much better anti-amoebic activity than the reference drug metronidazole (IC50 = 1.80 mu M). Further, cytotoxicity of the compounds having IC50 value less than metronidazole was assessed by MTT assay on human breast cancer MCF-7 cell line and all the compounds were found low cytotoxic in the concentration range of 2.5-250 mu M. Preliminary results indicate that these three compounds (1, 3 and 8) may be subjected to further investigations and it may be hoped that the present study will stimulate efforts towards the development of novel effective anti-amoebic agents.
1,3,4-Thiadiazole Derivatives. Synthesis, Structure Elucidation, and Structure−Antituberculosis Activity Relationship Investigation
作者:Elçin E. Oruç、Sevim Rollas、Fatma Kandemirli、Nathaly Shvets、Anatholy S. Dimoglo
DOI:10.1021/jm0495632
日期:2004.12.1
A series of 2,5-disubstituted-1,3,4-thiadiazoles were synthesized, the compounds structures were elucidated and screened for the antituberculosis activity against Mycobacterium tuberculosis H37Rv using the BACTEC 460 radiometric system. Among the tested compounds, 2-phenylamino-5-(4-fluorophenyl)-1,3,4-thiadiazole 22 showed the highest inhibitory activity. The relationships between the structures of compounds and their antituberculosis activity were investigated by the Electronic-Topological Method (ETM) and feed forward neural networks (FFNNs) trained with the back-propagation algorithm. As a result of the approach, a system of pharmacophores and anti-pharmacophores has been found that effectively separates compounds of the examination set into groups of active and inactive compounds. The system can be applied to the screening and design of new active compounds possessing skeletons similar to those used in the present study.