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。