1,3,4-Thiadiazole Derivatives. Synthesis, Structure Elucidation, and Structure−Antituberculosis Activity Relationship Investigation
摘要:
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.
Synthesis of 2-amino-substituted-1,3,4-thiadiazoles via 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) mediated intramolecular C–S bond formation in thiosemicarbazones
作者:Sarangthem Joychandra Singh、Suresh Rajamanickam、Anupal Gogoi、Bhisma K. Patel
DOI:10.1016/j.tetlet.2016.01.083
日期:2016.3
An effective oxidative intramolecular cyclization (C–S bondformation) of thiosemicarbazones using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) has been developed to afford a diverse array of 2-amino-substituted-1,3,4-thiadiazoles. The attractive features of this protocol are operational simplicity, obviates the need of expensive transition-metal catalysts and broad substrate scope.
Thiadiazole derivatives 1–24 were synthesized via a single step reaction and screened for in vitro β-glucuronidase inhibitory activity. All the synthetic compounds displayed good inhibitory activity in the range of IC50 = 2.16 ± 0.01–58.06 ± 1.60 μM as compare to standard d-saccharic acid 1,4-lactone (IC50 = 48.4 ± 1.25 μM). Molecular docking study was conducted in order to establish the structure–activity
Complexes of silicon and phosphorus chlorides with nitrogen-containing bases as the condensing agents in the synthesis of amides
作者:L. V. Besgubenko、S. E. Pipko、A. D. Sinitsa
DOI:10.1134/s1070363212080099
日期:2012.8
High effectiveness of new condensing agents on the basis of complexes of silicon and phosphorus chlorides with nitrogen-containing bases in the synthesis of amides from carboxylic acids and amines and also in heterocyclization is shown. Factors affecting the readiness of formation of the amide bond and the yields of the final products are established.
Srinivasan,V.R.; Ramachander,G., Indian Journal of Chemistry, 1963, vol. 1, p. 234 - 236