The chemical sulfation of β-resorcylicacid esters was investigated by applying state of the art procedures for the synthesis and deprotection of 2,2,2-trichloroethyl protected sulfates as appropriate intermediates. The selectivity of monosulfation was studied and reaction optimization was performed considering the effect of the solvent, different bases as well as the sulfation reagent itself. Finally
Divergent and Site-Selective Solid-Phase Synthesis of Sulfopeptides
作者:Deni Taleski、Stephen J. Butler、Martin J. Stone、Richard J. Payne
DOI:10.1002/asia.201100232
日期:2011.6.6
On solid ground: A solid‐phase strategy for the efficient synthesis of sulfopeptides is described. Selective deprotection of orthogonally‐protected tyrosine residues and solid‐phase sulfation provided divergent access to differentially sulfated peptides in high yields.
The synthesis of several sulfates of trichothecene mycotoxins is presented. Deoxynivalenol (DON) and its acetylated derivatives were synthesized from 3-acetyldeoxynivalenol (3ADON) and used as substrate for sulfation in order to reach a series of five different DON-based sulfates as well as T2-toxin-3-sulfate. These substances are suspected to be formed during phase-II metabolism in plants and humans
介绍了单端孢霉烯真菌毒素的几种硫酸盐的合成。脱氧雪腐镰刀菌烯醇 (DON) 及其乙酰化衍生物由 3-乙酰脱氧雪腐镰刀菌烯醇 (3ADON) 合成,并用作硫酸化的底物,以获得一系列五种不同的基于 DON 的硫酸盐以及 T2-toxin-3-sulfate。怀疑这些物质是在植物和人类的 II 期代谢过程中形成的。硫酸化使用硫酰基咪唑鎓盐进行,该盐在使用前合成。所有受保护的中间体和最终产品均通过 NMR 进行表征,并将作为参考材料用于真菌毒素毒理学和生物分析领域的进一步研究。
Endoxifen and Other Metabolites of Tamoxifen Inhibit Human Hydroxysteroid Sulfotransferase 2A1 (hSULT2A1)
作者:Edwin J. Squirewell、Xiaoyan Qin、Michael W. Duffel
DOI:10.1124/dmd.114.059709
日期:2014.11
alternate substrates for the enzyme. We found that 4-hydroxy-N-desmethyltamoxifen (endoxifen) is a potent inhibitor of hSULT2A1-catalyzed sulfation of PREG and DHEA, with Ki values of 3.5 and 2.8 μM, respectively. In the hSULT2A1-catalyzed sulfation of PREG, 4-hydroxytamoxifen (4-OHTAM) and N-desmethyltamoxifen (N-desTAM) exhibited Ki values of 12.7 and 9.8 μM, respectively, whereas corresponding Ki values
<i>O</i>- and <i>N</i>-Sulfations of Carbohydrates Using Sulfuryl Imidazolium Salts
作者:Laura J. Ingram、Ahmed Desoky、Ahmed M. Ali、Scott D. Taylor
DOI:10.1021/jo9014112
日期:2009.9.4
A series of sulfuryl imidazolium salts (SISs) were prepared and examined as reagents for incorporating trichloroethyl-protected sulfate esters into carbohydrates. The SIS that contained a 1,2-dimethylimidazolium moiety (SIS 9) proved to be a superior sulfating compared to SISs bearing no alkyl groups or bulkier alkyl groups on the imidazolium ring. Difficult O-sulfations that required prolonged reaction times and a large excess of the SIS bearing a 1-methylimidazolium group (SIS 5) were achieved in high yield using less than half the amount of SIS 9 in less time. Certain N-sulfated compounds that were practically inaccessible using SIS 5 were obtained in excellent yield using SIS 9.