Synthetic nucleosides and nucleotides. XIX. Synthesis of 3'-deoxycytidine 5'-triphosphate and related 3'-deoxyribonucleotides from cordycepin.
作者:MINEO SANEYOSHI、JUNICHI TOHYAMA、CHIKAO NAKAYAMA
DOI:10.1248/cpb.30.2223
日期:——
The pyrimidine 3'-deoxyriboside 5'-triphosphates, pyrimidine counterparts of cordycepin 5'-triphosphate, (1) were conveniently synthesized from cordycepin as potential deoxyribonucleic acid (DNA)-dependent ribonucleic acid (RNA) polymerase inhibitors. For the synthesis of 3'-deoxycytidine, p-chlororobenzoylation of 1 followed by acetolysis afforded an anomeric mixture of 1-O-acetyl-2, 5-di-O-p-chlorobenzoyl-3-deoxy-D-ribofuranose (3) in good yield. Condensation of 2, 4-bis-trimethylsilyl-N4-acylcytosine (4a, b) with 3 in the presence of stannic chloride gave fully acylated 3'-deoxycytidine (5) in excellent yield. The protecting group was removed to give 3'-deoxycytidine (6), which on phosphorylation gave 3'-deoxycytidine 5'-monophosphate (7), a key intermediate in the present study. Deamination of 7 with nitrous acid afforded 3'-deoxycytidine-5'-monophosphate (8). Additionally, 2, 4-bis-trimethylsilyloxy-5-methyl-or ethylpyrimidine (4c, d) was coupled with 3 in a similar manner to give fully acylated 5-methyl-(5c) or 5-ethyl-3'-deoxyuridine (5d). The 5'-monophosphates were converted to the corresponding 5'-triphosphates by the phosphoroimidazolidate method.
嘧啶 3'-脱氧核苷 5'-三磷酸,即虫草素 5'-三磷酸的嘧啶对应物,(1) 是由虫草素方便地合成的,作为潜在的脱氧核糖核酸 (DNA) 依赖性核糖核酸 (RNA) 聚合酶抑制剂。为了合成 3'-脱氧胞苷,将 1 对氯苯甲酰化,然后进行乙酰解,得到 1-O-乙酰基-2, 5-二-O-对氯苯甲酰基-3-脱氧-D-呋喃核糖 (3) 的异头混合物。屈服。 2, 4-双-三甲基甲硅烷基-N4-酰基胞嘧啶 (4a, b) 与 3 在氯化锡存在下缩合,以优异的收率得到完全酰化的 3'-脱氧胞苷 (5)。除去保护基团得到 3'-脱氧胞苷 (6),其磷酸化后得到 3'-脱氧胞苷 5'-单磷酸 (7),这是本研究中的关键中间体。用亚硝酸将 7 脱氨,得到 3'-脱氧胞苷-5'-单磷酸 (8)。另外,2, 4-双-三甲基甲硅烷氧基-5-甲基-或乙基嘧啶(4c, d)以类似的方式与3偶联,得到完全酰化的5-甲基-(5c)或5-乙基-3'-脱氧尿苷( 5d)。通过咪唑磷酸酯法将5'-单磷酸转化为相应的5'-三磷酸。