The title bis(purin-6-yl)acetylene and -diacetylene nucleoside derivatives were prepared as covalent base-pair analogues starting from acyl-protected 6-ethynylpurine and 6-iodopurine nucleosides by the Sonogashira cross-coupling or oxidative alkyne-dimerization reactions followed by deprotection. The key starting acyl-protected 6-ethynylpurine nucleosides were prepared by a sequence of cross-coupling reactions of protected 6-halopurine nucleosides with (trimethylsilyl)acetylene followed by a modified desilylation with TBAF in presence of acetic acid. Surprisingly, the acyl-protected nucleosides exhibited significant cytostatic activity higher than the fully deprotected title compounds.
标题为双(
嘌呤-6-基)
乙炔和-二
乙炔核苷衍
生物,通过Sonogashira交叉偶联或氧化炔基二聚反应起始于酰保护的6-
乙炔基
嘌呤和
6-碘嘌呤核苷,然后进行去保护作用制备共价碱基对类似物。关键的起始酰保护的6-
乙炔基
嘌呤核苷是通过保护的6-卤代
嘌呤核苷与(三甲基
硅基)
乙炔的交叉偶联反应序列,然后在存在
乙酸的TBAF的修饰去
硅化反应中制备的。令人惊讶的是,酰保护的核苷表现出显著的细胞增殖抑制活性,比完全去保护的标题化合物更高。