Bisphosphonate Derivatives of Nucleoside Antimetabolites: Hydrolytic Stability and Hydroxyapatite Adsorption of 5′-β,γ-Methylene and 5′-β,γ-(1-Hydroxyethylidene) Triphosphates of 5-Fluorouridine and <i>ara</i>-Cytidine
作者:Mikko Ora、Tuomas Lönnberg、Diana Florea-Wang、Shawn Zinnen、Alexander Karpeisky、Harri Lönnberg
DOI:10.1021/jo800317e
日期:2008.6.1
sign of metal ion catalysis. Under these conditions, the initial product, nucleoside 5′-monophosphate, underwent rapid dephosphorylation to the corresponding nucleoside. Hydrolysis of the β,γ-methylene derivatives (5, 7) to the corresponding nucleoside 5′-monophosphates was markedly faster in mouse serum than in aqueous buffer (pH 7.4), the rate-acceleration being 5600- and 3150-fold with 5 and 7, respectively
核苷抗代谢物的四种双膦酸酯衍生物的水解反应动力学,即5-氟尿苷5'-β,γ-(1-羟基亚乙基)三磷酸酯(4),5-氟尿苷5'-β,γ-亚甲基三磷酸酯(5),ARA胞苷5'-β,γ-(1-羟基亚乙基)三磷酸(6),和ARA -胞苷5'-β,γ亚甲基三磷酸(7),已经研究了在宽的pH范围(pH为1.0 -8.5)在90°C下。与每个化合物,起始材料的消失是伴随着形成相应的核苷单磷酸5'-的,该反应是最多2个数量级与β更快,γ-(1-羟基亚乙基)衍生物(4,6)比用β,γ亚甲基同行(5,7)。对于化合物7,胞嘧啶碱基的脱氨基与pH 3-6下的磷酸盐水解竞争。在不存在和存在二价碱土金属离子(Mg 2+和Ca 2+)的情况下,于37°C(pH 7.4)进行的测量均未发现金属离子催化的迹象。在这些条件下,初始产物核苷5'-单磷酸经历了快速的去磷酸化为相应的核苷。在β,γ亚甲基衍生物的水解(5,7在小鼠