Nucleosides with self-complementary hydrogen-bonding motifs: Synthesis and base-pairing studies of two nucleosides containing the imidazo[4,5-d]pyridazine ring system
作者:R UJJINAMATADA、R PAULMAN、R PTAK、R HOSMANE
DOI:10.1016/j.bmc.2006.05.043
日期:2006.9.15
Synthesis and base-pairing studies of two 2'-deoxyribonucleosides, containing a common heterocyclic base, 7(4)-amino-5(6)H-imidazo[4,5-d]pyridazin-4(7)one (1 and 2), have been reported. The synthesis was accomplished by base-promoted deoxyribosylation of ethyl 5(4)-cyanoimidazole-4(5)-carboxylate (6), followed by ring-closure with hydrazine hydrate. The 1H NMR-based base-pair studies were conducted
两种2'-脱氧核糖核苷的合成和碱基配对研究,它们含有一个共同的杂环碱基7(4)-氨基-5(6)H-咪唑并[4,5-d]哒嗪-4(7)one(1和2),已有报道。通过碱促进5(4)-氰基咪唑-4(5)-羧酸乙酯(6)的碱促进的脱氧核糖基化,然后用水合肼进行闭环来完成合成。基于1H NMR的碱基对研究是使用DMF-d7作为溶剂,通过测量核苷的氨基,酰肼,咪唑H-2和糖H-1'质子的化学位移随浓度变化而变化的和温度。当温度从25降至0摄氏度,然后以10摄氏度的间隔进一步降至-50摄氏度时,NH,NH2的低场化学位移较大,H-1'质子的位移较小。观察到的实验数据与分子模型研究的结果一致。核苷2在CEM-SS细胞中表现出针对HIV-1的低水平抗病毒活性,IC50为89.2 microM。在测试化合物的最高浓度下未观察到细胞毒性。