This work describes novel in vitro inhibitors of human mitochondrial (mdN) and cytosolic (cdN) 5′(3′)-deoxynucleotidases. We designed a series of derivatives of the lead compound (S)-1-[2-deoxy-3,5-O-(phosphonobenzylidene)-β-D-threo-pentofuranosyl]thymine bearing various substituents in the para position of the benzylidene moiety. Detailed kinetic study revealed that certain para substituents increase
这项工作描述了人类线粒体(mdN)和胞质(cdN)5'(3')-脱氧核苷酸酶的新型体外抑制剂。我们设计了一系列铅化合物(S)-1- [2-脱氧-3,5 - O-(膦酰苄叉基)-β- D-苏-戊呋喃糖基]胸腺嘧啶的衍生物,这些胸腺嘧啶在苄叉基的对位带有多个取代基部分。详细的动力学研究表明,某些对位取代基提高了抑制能力(碘衍生物;K mdN i = 2.71μM),而某些取代基诱导了对cdN的选择性转移(羧基衍生物,K cdN i= 11.60μM; 碘氧基衍生物,K cdN i = 6.60μM)。与这些化合物中的三种复合的mdN晶体结构表明,各种对位取代基在酶活性位点内导致两种替代的抑制剂结合方式。还通过异核NMR光谱法鉴定了cdN络合物的两种结合模式。
Indirect electrochemical side-chain oxidation of alkyl aromatic compounds - selective synthesis of methyl benzoates or ortho-benzoic acid trimethylesters
The technically important side-chain oxidation of alkyl aromaticcompounds to from either methyl benzoates or orthobenzoic acid trimethylesters can be performed electrochemically at low potentials in methanol solution using an undivided cell and tris(2,4-dibromopheny1)amine as redox catalyst. Under neutral or slightly acidic conditions methyl benzoates are selectively formed while under basic conditions
In the present work a brief overview of microstructured devices, the advantages and disadvantages as well as the principles of a multiscale design approach are presented. The advantages mainly comprise uniform current density distribution, local control of the process parameters, high single-pass conversion of the reactant and reduced concentration of the supporting electrolyte needed to perform the
The reaction of methyl dithiocarboxylates with dialkoxydibutylstannanes at 60-95°C afforded the corresponding trialkyl orthocarboxylates in good yields.
Isolation of Dithiolanylium Salts and Their Conversion to Ketene Dithioacetals and Ortho Esters
作者:Tadashi Okuyama、Wataru Fujiwara、Takayuki Fueno
DOI:10.1246/bcsj.59.453
日期:1986.2
prepared by the reaction of 1,2-ethanedithiol with acyl chlorides in the presence of perchloric acid. Treatments of 1 with triethylamine gave 2-alkylidene-1,3-dithiolane (2) when the 2-substituent was a primary or secondary alkyl group. 2-Aryl derivatives of 1 were converted to ortho esters by the reaction with methanol in the presence of silver nitrate. 1,3-Dithian-2-ylium perchlorates and 2-alkylidene-1