O2-(N-Hydroxy(methoxy)-2-ethanesulfonamido) Protected Diazen-1-ium-1,2-diolates: Nitric Oxide Release via a Base-Induced β-Elimination Cleavage
摘要:
O-2-(Ethanesulfohydroxamic acid) and O-2-(N-methoxy-2-ethanesulfonylamido) diazen-1-ium-1,2-diolates (4-7), a novel type of O-2-(protected) diazeniumdiolate, were synthesized using a key thioacetate oxidation reaction. Nitric oxide release studies showed that O-2-(N-methoxy-2-ethanesulfonylamido) diazeniumdiolates 5 and 7 released NO in a nonphysiological alkaline buffer, in the presence of bases such as the basic natural amino acids Arg and His, or the non-nucleophilic organic base DBU in PBS at pH 7.4, via a beta-elimination cleavage reaction.
Hg–C bond protonolysis by a functional model of bacterial enzyme organomercurial lyase MerB
作者:Ramesh Karri、Ranajit Das、Rakesh Kumar Rai、Anaswara Gopalakrishnan、Gouriprasanna Roy
DOI:10.1039/d0cc02232b
日期:——
Herein, we report a novel synthetic compound 1, having a highly nucleophilic selenolate (Se−) moiety and a thiol (–SH) functional group, which showed efficient Hg–C bond protonolysis of various R–Hg–X molecules including neurotoxic methylmercury and thimerosal, via direct –SH proton transfer to the highly activated C-atom of a departed R group with low activation energy barrier at room temperature
Phosphonocarboxylate compounds pharmaceutical compositions, and methods
申请人:The Procter & Gamble Company
公开号:US05760021A1
公开(公告)日:1998-06-02
The present invention relates to compositions comprising pharnaceutically-acceptable carriers and a phosphonocarboxylate, or a pharmaceutically-acceptable salt thereof, having a structure according to formula (I): ##STR1##
Synthesis of Phosphorodithioate DNA via Sulfur-Linked, Base-Labile Protecting Groups<sup>1</sup>
作者:William T. Wiesler、Marvin H. Caruthers
DOI:10.1021/jo960274y
日期:1996.1.1
deoxynucleoside thiophosphite. Subsequent steps involved oxidation with sulfur to generate the completely protected phosphorodithioate triester, acylation of unreacted deoxynucleoside, and removal of the 5'-protecting group. Yields per cycle were usually 97-98% with 2-5% phosphorothioate contamination as determined by (31)P NMR. By using deoxynucleoside 3'-phosphorothioamidites and deoxynucleoside 3'-phosphoroamidites
Helicobacter pylori are reported. Bloodgroup Antigen Binding Adhesin (BabA), a bacterial membrane-bound lectin, binds to human ABO and Lewis bbloodgroup structures displayed on the surface of host epithelial cells. Crystal structures of the carbohydrate-recognition domain revealed a conserved disulfide bonded loop that anchors a critical fucose residue in these bloodgroup structures. Disruption of this
报道了六种显示硫醇的单糖的合成,用于幽门螺杆菌的自杀抑制。血型抗原结合粘附素 (BabA) 是一种细菌膜结合凝集素,可与宿主上皮细胞表面显示的人 ABO 和 Lewis b 血型结构结合。碳水化合物识别域的晶体结构揭示了一个保守的二硫键环,该环将关键的岩藻糖残基锚定在这些血型结构中。N-乙酰半胱氨酸破坏该环会导致 BabA 介导的对人胃组织切片的粘附减少,并减弱表达 Lewis b 的转基因小鼠的毒力。为了创造凝集素的特异性抑制剂,我们设计并成功合成了六种具有硫醇基序的岩藻糖衍生化合物,与BabA的二硫键进行硫醇-二硫键交换,形成聚糖-凝集素二硫键。用 2-和 3-碳硫醇基序分支和延伸岩藻糖主链提供了一系列候选物,用于测试针对 BabA 的生物活性。