Catalysis by Ionic Liquids: Significant Rate Acceleration with the Use of [pmIm]Br in the Three-Component Synthesis of Dithiocarbamates
作者:Brindaban C. Ranu、Amit Saha、Subhash Banerjee
DOI:10.1002/ejoc.200700842
日期:2008.1
An easily accessible neutral ionic liquid, 1-methyl-3-pentylimidazolium bromide, promoted a one-pot three-component condensation of an amine, carbon disulfide, and an activated alkene/dichloromethane/epoxide to produce the corresponding dithiocarbamates in high yields at room temperature. The reactions are very fast in ionic liquids relative to those in other reaction media. These reactions do not
A mild, convenient, and practical one-pot procedure for the direct synthesis of dithiocarbamates has been developed by condensation of amines, CS 2 , and a Michael acceptor, undersolvent-freeconditions at room temperature in good to excellent yields.
economic, and green method for the synthesis of dithiocarbamate derivatives in water. The one-pot, three-component condensation of primary and secondary amines with carbon disulfide and unsaturated carbonyl compounds or alkyl halides under ultrasonic irradiation was developed as a green and fast protocol for the rapid high-yielding preparation of dithiocarbamates in water. Graphical abstract
An efficient synthesis of aryldithiocarbamic acid esters from Michael addition of electron-deficient alkenes with arylamines and CS2 in solid media alkaline Al2O3
作者:Shuai Xia、Xin Wang、Ze-mei Ge、Tie-ming Cheng、Run-tao Li
DOI:10.1016/j.tet.2008.11.084
日期:2009.1
An efficient synthesis of dithiocarbamic acid esters from Michael addition of electron-deficient alkenes with arylamines and CS2 in solid media alkaline Al2O3 was presented. This method was suitable for a wide range of amines and a variety of Michael receptors. Specially, a series of aryldithiocarbamic acid esters was obtained from arylamines through this method. The protocol offers clean reactions and high yields with simple experimental procedures. Besides, the alkaline Al2O3 could be reused. (C) 2008 Elsevier Ltd. All rights reserved.
Exploring the Structural Requirements for Inhibition of the Ubiquitin E3 Ligase Breast Cancer Associated Protein 2 (BCA2) as a Treatment for Breast Cancer
作者:Ghali Brahemi、Fathima R. Kona、Annalisa Fiasella、Daniela Buac、Jitka Soukupová、Andrea Brancale、Angelika M. Burger、Andrew D. Westwell
DOI:10.1021/jm901757t
日期:2010.4.8
The zinc-ejecting aldehyde dehydrogenase (A LDH) inhibitory drug disulfiram (DS F) was found to be a breast cancer-associated protein 2 (BCA2) inhibitor with potent antitumor activity. We herein describe our work in the synthesis and evaluation of new series of zinc-affinic molecules to explore the structural requirements for selective BCA2-inhibitory antitumor activity. An N(C=S)S-S motif was found to be required, based on selective activity in BCA2-expressing breast cancer cell lines and against recombinant BCA2 protein. Notably, the DSF analogs (3a and 3c) and dithio(peroxo)thioate compounds (5d and 5f) were found to have potent activity (submicromolar IC(50)) in BCA2 positive MCF-7 and T47D cells but were inactive (IC(50)> 10 mu M) in BCA2 negative M DA-MB-231 breast cancer cells and the normal breast epithelial cell line MCF10A. Testing in the isogenic BCA2 +ve M DA-MB-231/ER cell line restored antitumor activity for compounds that were inactive in the BCA2 -ve MDA-MB-231 cell line. In contrast, structurally related dithiocarbamates and benzisothiazolones (lacking the disulfide bond) were all inactive. Compounds 5d and 5f were additionally found to lack ALDH-inhibitory activity, suggestive of selective E3 ligase-inhibitory activity and worthy of further development.