Synthesis of α-Deoxymono and Difluorohexopyranosyl 1-Phosphates and Kinetic Evaluation with Thymidylyl- and Guanidylyltransferases
作者:Jian-She Zhu、Nicole E. McCormick、Shannon C. Timmons、David L. Jakeman
DOI:10.1021/acs.joc.6b01485
日期:2016.10.7
monofluoro substitution at C-2, C-4, and C-6 and difluoro substitution at C-2 within two orders of magnitude. In contrast, the kinetic analysis of GDP-ManPP was only possible with three out of eight analogues. The pKa2 values of analogues (1–3) were determined by proton decoupled 31P and 19F NMR titration experiments. Counterintuitively, the axial fluoro substituent in 3 did not change chemical shift upon
已经合成了八个氟化的等排α - d-吡喃葡萄糖基1-磷酸酯(Glc 1P)类似物。胸腺嘧啶转移酶Cps2L和胍基转移酶GDP-ManPP与这些类似物的滥交调查显示,除1,6-二磷酸6以外,所有这些均被任一酶所接受。使用连续偶联测定法确定这些类似物的动力学参数。这些数据证明了Cps2L的广泛底物滥交,k cat / K mC-2,C-4和C-6处的单氟取代和C-2处的二氟取代在两个数量级内变化。相反,只有八分之三的类似物才能对GDP-ManPP进行动力学分析。在p ķ一个2个类似物的值(1 - 3)通过质子去耦测定31 P和19个F NMR滴定实验。与直觉相反,在3中的轴向氟取代基在滴定时没有改变化学位移,并且与单氟类似物相比,二氟类似物的酸度没有显着增加。在所有五种底物之间均未观察到强烈的布朗斯台德线性自由能相关性(1 –3,Glc 1P和Man 1P)用于任一酶催化的反应。但是,在选定的