Solvent-Free Synthesis of Heterocyclic Thioureas Using Microwave Technology
作者:Jian-Ping Li、Qian-Fu Luo、Yu-Lu Wang、Hong Wang
DOI:10.1002/jccs.200100013
日期:2001.2
A new and rapid solvent-freesynthesis of heterocyclic thioureas in a microwave oven has been reported for the first time. Nine heterocyclic thioureas that possess biological activity have been synthesized. The reaction time is short (2–4.5 min) and gives excellent yields (82.9–95.5%).
have been prepared. The structure of these thiazolidones was confirmed by studying their hydrolysis products. Some of these thiazolidones were screened for their fungicidal activity against Aspergillus niger by agar-growth method and found to be more appropriately fungistatic and not fungicidal.
Synthesis and cytotoxic evaluation of thiourea and N-bis-benzothiazole derivatives: A novel class of cytotoxic agents
作者:Ravindra M. Kumbhare、Tulshiram Dadmal、Umesh Kosurkar、V. Sridhar、J. Venkateswara Rao
DOI:10.1016/j.bmcl.2011.10.106
日期:2012.1
Benzothiazolyl thiocarbamides has been achieved using a catalytic amount of 4-dimethylaminopyridine (DMAP) followed by its chemoselective oxidative cyclization with 1,3-di-n-butylimidazolium tribromide[bbim][Br-3] to afford the N-bis-benzothiazole derivatives. All the synthesized compounds were evaluated for cytotoxic activity against two human monocytic cell lines (U 937, THP-1) and a mouse melanoma cell line (B16-F10). Based on their IC50 values, the majority of the benzothiazolyl thiocarbamides and N-bis-benzothiazoles had significant antiproliferative activity on U 937 and B16-F10 cells, the compounds 3b, 3e, 3f, 3k, 6c and 6h were found to be the most active. The present findings indicate clearly that the compound 3e exhibited more antiproliferative activity on U 937 cells than the standard molecule, etoposide. Nevertheless, these compounds have shown comparatively less cytotoxicity towards THP-1 cells. (C) 2011 Elsevier Ltd. All rights reserved.