877781-02-7Relevant articles and documents
SAR studies on 1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles as inhibitors of Mtb shikimate dehydrogenase for the development of novel antitubercular agents
Li, Ziqiang,Liu, Yishuang,Bai, Xiaoguang,Deng, Qi,Wang, Juxian,Zhang, Guoning,Xiao, Chunling,Mei, Yaning,Wang, Yucheng
, p. 97089 - 97101 (2015/12/01)
Shikimate dehydrogenase, an essential protein for the biosynthesis of the chorismate end product, is a highly promising therapeutic target, especially for the discovery and development of new-generation anti-TB agents. Following up the identification of one lead 3,6-disubstituted 1,2,4-triazolo[3,4-b][1,3,4]thiadiazole (1), targeting Mt SD in our previous study, an extensive SAR study for optimization of the lead compound was performed through systematic modification of the 3 and 6 positions. This study has successfully led to the discovery of two highly potent advanced leads 6d-4, 6c-4 and several other compounds with comparable potencies (6d-4, MIC-H37Rv = 0.5 μg mL-1; MIC-MDRTB = 4.0 μg mL-1; MIC-RDRTB = 0.5 μg mL-1; Mt SD-IC50 = 14.20 μg mL-1; and 6c-4, MIC-H37Rv = 0.5 μg mL-1; MIC-MDRTB = 4.0 μg mL-1; MIC-RDRTB = 1.0 μg mL-1; Mt SD-IC50 = 6.82 μg mL-1). These advanced lead compounds possess a para-halogen phenyl at the 3 position. In vitro Mt SD inhibitory assay indicates that Mt SD is the target for their antitubercular activity. Moreover, the BacT/ALERT 3D liquid culture technology and in vitro Mt SD inhibitory assay were initially applied.
Exploration of a library of triazolothiadiazole and triazolothiadiazine compounds as a highly potent and selective family of cholinesterase and monoamine oxidase inhibitors: Design, synthesis, X-ray diffraction analysis and molecular docking studies
Khan, Imtiaz,Bakht, Syeda Mahwish,Ibrar, Aliya,Abbas, Saba,Hameed, Shahid,White, Jonathan M.,Rana, Usman Ali,Zaib, Sumera,Shahid, Mohammad,Iqbal, Jamshed
, p. 21249 - 21267 (2015/03/30)
There is a high demand for the collection of small organic molecules (especially N-heterocycles) with diversity and complexity in the process of drug discovery. This need for privileged scaffolds in medicinal research gives an impetus for the development of nitrogen-containing compounds which are widely encountered in natural products, drugs and pharmaceutically active compounds. In this context, a diverse library of new triazolothiadiazole (4a-l) and triazolothiadiazine (5a-p) compounds was designed, synthesized and evaluated as potent and selective inhibitors of electric eel acetylcholinesterase (EeAChE) and horse serum butyrylcholinesterase (hBChE) by Ellman's method using neostigmine and donepezil as standard inhibitors. Among the screened triazolothiadiazoles, 4j emerged as a lead candidate showing the highest inhibition with an outstanding IC50 value of 0.117 ± 0.007 μM against AChE, which is ～139-fold greater inhibitory efficacy as compared to neostigmine, whereas 4k displayed ～506-fold strong inhibition with IC50 of 0.056 ± 0.001 μM against BChE. In the triazolothiadiazine series, 5j and 5e depicted a clear selectivity towards EeAChE with IC50 values of 0.065 ± 0.005 and 0.075 ± 0.001 μM, respectively, which are ～250- and ～218-fold stronger inhibition as compared to neostigmine (IC50 = 16.3 ± 1.12 μM). In addition, the synthesized compounds were also tested for their monoamine oxidase (MAO-A and MAO-B) inhibition, where 4a from the triazolothiadiazole series delivered the highest potency against MAO-A with an IC50 value of 0.11 ± 0.005 μM which is ～33-fold higher inhibition as compared to the standard inhibitor, clorgyline (IC50 = 3.64 ± 0.012 μM), whereas compound 5c from the triazolothiadiazine series turned out to be a lead inhibitor with an IC50 value of 0.011 ± 0.001 μM which is ～330-fold stronger inhibition. Moreover, compounds 4b (triazolothiadiazole series) and 5o (triazolothiadiazine series) were identified as lead inhibitors against MAO-B. Molecular modelling studies were performed against human AChE and BChE to observe the binding site interactions of these compounds.
