A Copper‐Catalyzed, pH‐Neutral Construction of High‐Enantiopurity Peptidyl Ketones from Peptidic
<i>S</i>
‐Acylthiosalicylamides in Air at Room Temperature
作者:Lanny S. Liebeskind、Hao Yang、Hao Li
DOI:10.1002/anie.200804524
日期:2009.2.9
A copper‐catalyzed transformation of peptidic thiol esters and boronic acids gives peptidylketones and takes place in DMF or DMF/H2O at roomtemperature in air (see scheme). This aerobic reaction only occurs at a thiol ester group capable of coordinating to Cu through its appendage on the sulfur center and is not hampered by racemization of the reactants or products.
肽硫羟酸酯和硼酸的铜催化转化产生肽基酮,并在室温空气中的 DMF 或 DMF/H 2 O 中发生(参见方案)。这种需氧反应仅发生在能够通过硫中心上的附属物与Cu配位的硫羟酸酯基团处,并且不受反应物或产物的外消旋作用的阻碍。
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.
Electrochemical synthesis for benzisothiazol-3(2H)-ones by dehydrogenative N S bond formation
Herein, we report an electrochemical method for the synthesis of benzisothiazol-3(2H)-ones from 2-mercaptobenzamides. The electrochemical reaction proceeds through intramolecular NH/SH coupling cyclization reaction by generating H2 as the nonhazardous side product. Moreover, the developed procedure is highly advantageous due to its short reaction time, mild conditions and wide substrate scope without
在此,我们报告了一种从 2-巯基苯甲酰胺合成苯并异噻唑-3(2H)-酮的电化学方法。电化学反应通过分子内 N H/S H 偶联环化反应进行,生成 H 2作为无害副产物。此外,该方法反应时间短,条件温和,底物范围广,无需使用金属催化剂和外源性氧化剂。2009 Elsevier Ltd. 版权所有。
Plasticizing natural and synthetic elastomers by incorporation of n-isopropyl thiosalicylamide