Synthesis of 6,5'-cyclo-5'-deoxyuridines by radical cyclization (nucleosides and nucleotides. L).
作者:TOHRU UEDA、HIROYUKI USUI、SATOSHI SHUTO、HIDEO INOUE
DOI:10.1248/cpb.32.3410
日期:——
6, 5'-Cyclo-5'-deoxyuridine, a fixed anti form of uridine, was synthesized by a radical cyclization of 5'-bromo (or iodo)-5'-deoxy-2', 3'-O-isopropylidene-5-chloro (or bromo)-uridine with tri-■-butyltin hydride followed by dehydrohalogenation and deacetonation. The 5-bromo and 4-thio derivatives of the cyclouridine were also prepared and were converted to the 2', 3'-cyclic phosphates. These nucleotides were hydrolyzed by pancreatic ribonuclease. The result showed that the enzyme recognizes the pyrimidine nucleotides in the anti form. 6, 5'-Cyclo-5'-deoxycytidine was also synthesized by two routes.
6, 5'-环-5'-脱氧尿苷是尿苷的固定反式,通过 5'-溴(或碘)-5'-脱氧-2', 3'-O-异亚丙基-的自由基环化合成5-氯(或溴)-尿苷与三丁基氢化锡反应,然后进行脱卤化氢和脱丙酮反应。还制备了环尿苷的5-溴和4-硫代衍生物并将其转化为2',3'-环状磷酸酯。这些核苷酸被胰腺核糖核酸酶水解。结果表明该酶识别反式嘧啶核苷酸。 6, 5'-Cyclo-5'-脱氧胞苷也通过两条路线合成。