Synthesis and anti-HIV-1 activity of novel bicyclic nucleoside analogues restricted to an S-type conformation
作者:Lisbet Kvrnø、Claus Nielsen、Richard H. Wightman
DOI:10.1039/b004774k
日期:——
(1S,3R,4S)-3-Hydroxymethyl-1-(uracil-1-yl)-2,5-dioxabicyclo[2.2.1]heptane 9 and the corresponding cytosine derivative 10, nucleoside analogues with a novel bicyclic nucleoside structure 3, were synthesized in a few steps from the known 1-(3′-deoxy-β-D-psicofuranosyl)uracil 4. NOE experiments verified the bicyclic nucleosides to be restricted to the expected S-type furanose conformation while the nucleobase is in an anti-conformation. Both nucleosides proved to be devoid of anti-HIV activity in MT-4 cells, which further supports the hypothesis that conformational flexibility of the furanose ring in a nucleoside analogue is necessary to obtain both intracellular 5′-triphosphorylation and inhibition of HIV-1 reverse transcriptase.
(1S,3R,4S)-3-羟甲基-1-(尿嘧啶-1-基)-2,5-二氧杂环[2.2.1]庚烷 9 和相应的胞嘧啶衍生物 10 是具有新型双环核苷结构 3 的核苷类似物,由已知的 1-(3′-脱氧-β-D-二十呋喃糖基)尿嘧啶 4 通过几个步骤合成。NOE 实验验证了双环核苷仅限于预期的 S 型呋喃糖构象,而核碱基则处于反构象。事实证明,这两种核苷在 MT-4 细胞中都没有抗 HIV 活性,这进一步证实了一个假设,即核苷类似物中呋喃糖环的构象灵活性是获得细胞内 5′-三磷酸化和抑制 HIV-1 逆转录酶的必要条件。