incorporated into oligonucleotides. The acid-base properties of this nucleoside and the corresponding N9-methylated derivative were investigated by pD-dependent 1H NMR spectroscopy. A possible formation of Hoogsteen-type base pairs with cytosine was studied by ultraviolet (UV) and circular dichroism (CD) spectroscopy in the presence and absence of Ag(I) and under neutral and acidic conditions, respectively. In
合成了含有1,3-二氮杂-6-硝基
嘌呤的2'-脱氧
核糖核苷,并将其掺入寡核苷酸中。通过依赖pD的1 H NMR光谱研究了该核苷和相应的N9-甲基化衍
生物的酸碱性质。在存在和不存在Ag(I)的情况下,分别在中性和酸性条件下,通过紫外(UV)和圆二色性(CD)光谱研究了可能存在的带有
胞嘧啶的Hoogsteen型碱基对。在每种情况下,均未获得形成Hoogsteen型碱基对的迹象,这归因于
胞嘧啶在酸性条件下形成自身互补的半质子化碱基对的亲和力更高,并且在
金属离子存在下
金属介导的均质碱基对的形成。 Ag(I)。