Studies on Synthesis and Pharmacological Activities of 1,2,4-Triazolo[3,4-<i>b</i>]1,3,4-thiadiazoles and their Dihydro Analogues
作者:Vinod Mathew、Devasahayam Giles、Jathi Keshavayya、Vijaya P. Vaidya
DOI:10.1002/ardp.200800073
日期:2009.4
4‐Amino‐5‐substituted aryl‐3‐mercapto‐1,2,4‐triazoles are versatile synthons for constructing various biologically active heterocycles. Starting from 4‐amino‐5‐substituted aryl‐3‐mercapto‐1,2,4‐triazole 3a–c, a series of new 3,5‐disubstituted‐1,2,4‐triazolo‐[3,4‐b]1,3,4‐thiadiazoles and their 5,6‐dihydrotriazolothiadiazoles were prepared. The structures of all the newly synthesized compounds have been
Heterocyclic system containing bridgehead nitrogen atom: synthesis and pharmacological activities of some substituted 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles
作者:V. Mathew、J. Keshavayya、V.P. Vaidya
DOI:10.1016/j.ejmech.2006.03.018
日期:2006.9
Several 3,6-disubstituted-1,2,4-triazolo[3,4-b]-1,3,4-thiadizoles were prepared by the condensation of 4-amino-3-aryl/aralkyl substituted-5-mercapto-1,2,4-triazoles 3(a-c) with various substituted aromatic/hetero aromatic acids through a single step reaction. Elemental analysis, IR, 1H NMR and mass spectral data confirmed the structure of the newly synthesized compounds. Synthesized triazolo thiadiazoles
通过4-氨基-3-芳基/芳烷基取代的5-巯基-的缩合反应,制备了几种3,6-二取代-1,2,4-三唑并[3,4-b] -1,3,4-噻二唑。 1,2,4-三唑3(ac)与各种取代的芳族/杂芳族酸通过一步反应进行合成。元素分析,IR,1 H NMR和质谱数据证实了新合成化合物的结构。研究了合成的三唑并噻二唑的抗菌,抗真菌,消炎和镇痛作用。一些测试的化合物对各种测试的细菌和真菌菌株显示出中等的抗菌活性。合成的化合物均不具有显着的抗炎和镇痛活性。
1H and13C NMR spectral characterization of some novel 7H-1,2,4-triazolo[3, 4-b] [1,3,4] thiadiazine derivatives
1H and13C NMR study of 5-substituted-4- (arylidene)amino-2,4-dihydro-3H-1,2,4-triazole-3-thiones and 6-aryl-3-(D-gluco- pentitol-1-yl)-7H-1,2,4-triazolo[3,4-b] [1,3,4]thiadiazines
Synthesis and biological activity of oxadiazole and triazolothiadiazole derivatives as tyrosinase inhibitors
作者:Kok Wai Lam、Ahmad Syahida、Zaheer Ul-Haq、Mohd. Basyaruddin Abdul Rahman、Nordin H. Lajis
DOI:10.1016/j.bmcl.2010.04.067
日期:2010.6
A series of 16 oxadiazole and triazolothiadiazole derivatives were designed, synthesized and evaluated as mushroom tyrosinase inhibitors. Five derivatives were found to display high inhibition on the tyrosinase activity ranging from 0.87 to 1.49 mu M. Compound 5 exhibited highest tyrosinase inhibitory activity with an IC50 value of 0.87 +/- 0.16 mu M. The in silico protein-ligand docking using AUTODOCK 4.1 was successfully performed on compound 5 with significant binding energy value of -5.58 kcal/mol. The docking results also showed that the tyrosinase inhibition might be due to the metal chelating effect by the presence of thione functionality in compounds 1-5. Further studies revealed that the presence of hydrophobic group such as cycloamine derivatives played a major role in the inhibition. Piperazine moiety in compound 5 appeared to be involved in an extensive hydrophobic contact and a 2.9 angstrom hydrogen bonding with residue Glu 182 in the active site. (C) 2010 Elsevier Ltd. All rights reserved.