thienopyrimidine nucleoside and the benzodiazepine nucleoside of 2-deoxy-D-ribose. For incorporation into oligonucleotides by solid-phase synthesis, both derivatives were transformed into the related 3′-phosphoramidite building blocks. These phosphoramidites were then site-specifically incorporated into DNA oligonucleotides. The modified DNA strands were hybridized with different DNA and RNA strands, and
开发了一种有效的方法来制备同型-C-核苷。
D-核糖的β-烯丙基C-糖苷转化为
噻吩并
嘧啶核苷和
2-脱氧-D-核糖的苯二氮卓核苷。为了通过固相合成掺入寡核苷酸,两种衍
生物都被转化为相关的 3'-亚
磷酰胺结构单元。然后将这些亚
磷酰胺定点掺入 DNA 寡核苷酸中。将修饰后的 DNA 链与不同的 DNA 和 RNA 链杂交,研究了它们的解链温度和圆二色光谱。有趣的是,尽管在 DNA-DNA 杂交的情况下,非天然核苷导致熔解温度显着降低,甚至低于错配杂交的
水平,