further phosphorylated to the 5'-triphosphates by the phosphoroimidazolidate method. The nucleosides (5a-d) were examined for growth-inhibitory effects on mouse leukemic L5178Y cells, and their IC50 values (microgram/ml) were 1.8, 33, 6.5, and 18, respectively. On the other hand, the antiviral activities of these compounds on a rhabdovirus, infectious hematopoietic necrosis virus (IHNV), were moderate (IC50
衍生自抗生素
虫草素的1-O-乙酰基-2,5-二-Op-
氯苯甲酰基-3-脱氧-D-
呋喃核糖(1)与N4-丙酰
胞嘧啶N4-p的三甲基甲
硅烷基化衍
生物(2a-c)偶联在三甲基甲
硅烷基
三氟甲磺酸酯(TMS-
三氟甲磺酸酯)存在下,将
甲苯基-5-
氟胞嘧啶和5-
氟尿
嘧啶生成完全酰化的核苷(分别为3a-b和3d)。通过用
水合
肼处理选择性除去3a的N4-丙酰基,得到2′,5′-二-Op-
氯苯甲酰基-3′-脱氧
胞苷(4)。在
三氟乙酸中用
亚硝酸钠对4进行脱
氨基反应,得到2',5'-二-Op-
氯苯甲酰
尿苷(3c),收率很高。将化合物3a-d皂化,得到游离的3'-脱氧
胞苷(5a),5-
氟-3'-脱氧
胞苷(5b),3'-脱氧
尿苷(5c)和5-
氟-3'-脱氧
尿苷(5d),分别。这3' 然后将-脱氧
核糖核苷(5a-d)转化为相应的5'-单
磷酸酯,并通过
磷杂
咪唑酸酯方法将其进一步
磷酸化为5'-
三磷酸酯。检查了核苷(5a-d