Tandem synthesis of [1,2,4]-triazoles mediated by iodine—a regioselective approach
作者:Srimanta Guin、Saroj Kumar Rout、Nilufa Khatun、Tuhin Ghosh、Bhisma K. Patel
DOI:10.1016/j.tet.2012.04.042
日期:2012.6
A tandem regioselective one-pot synthesis of 3-amino-[1,2,4]-triazoles has been achieved from 1,3-disubstituted thioureas using molecular iodine. In this one-pot strategy, the intermediate carbodiimide generated in situ from thiourea upon reaction with HCONHNH2 gives diaryl/alkylhydrazinecarboximidamide or acylureidrazone, which then undergoes an intramolecular cyclodehydration to afford the corresponding 3-amino-[1,2,4]-triazole. The product regioselectivity for unsymmetrical 1,3-disubstituted thioureas correlate well with the pK(a)s of the parent amines attached, in which the amine having higher pK(a) goes to the ring nitrogen while the other nitrogen remains flanked as an exocyclic nitrogen of the triazole core. This method is milder and environmentally sustainable giving good to excellent yields of the desired products. (C) 2012 Elsevier Ltd. All rights reserved.
THIOUREA DERIVATIVES AS a-CHYMOTRYPSIN INHIBITORS
申请人:Rahman Atta-ur
公开号:US20150080580A1
公开(公告)日:2015-03-19
α-Chymotrypsin inhibitors of thiourea class are reported that could be potent inhibitors of proteases, elastases, proteasomes, NS3 and NS4 serine protease of hepatitis C virus, dengue virus, etc. Compounds
1
-
22,
which are belong to thiourea class, showed good inhibition. Their kinetics study and cytotoxicity profiles showed all type of inhibition except uncompetitive-type inhibition and no cytotoxicity except few compounds. Competitive type of inhibitors could inhibit other α-chymotrypsin-like serine proteases, which are therapeutics target.
Synthesis and in vitro urease inhibitory activity of N,N′-disubstituted thioureas
作者:Khalid Mohammed Khan、Farzana Naz、Muhammad Taha、Ajmal Khan、Shahnaz Perveen、M.I. Choudhary、Wolfgang Voelter
DOI:10.1016/j.ejmech.2014.01.001
日期:2014.3
Thiourea derivatives (1–38) were synthesized and evaluated for their urease inhibition potential. The synthetic compounds showed a varying degree of in vitro urease inhibition with IC50 values 5.53 ± 0.02–91.50 ± 0.08 μM, most of which are superior to the standard thiourea (IC50 = 21.00 ± 0.11 μM). In order to ensure the mode of inhibition of these compounds, the kinetic study of the most active compounds