products accompanied by minor formation of α-furanosidic-, α-pyranosidic-, and β-pyranosidic nucleosides. On the other hand, 3,3′,5′-trisubstitued thymidine analogues were only deglycosylated and anomerized. These results are similar to those observed for the acidic hydrolysis of the glycoside bond in nucleosides, but were presumably caused by the Lewis acid character of an iodine electrophile.
研究了
胸苷、3-单-和 3,3',5'-三烷基取代的
胸苷类似物与
一氯化碘 (ICl) 的反应。在各种反应条件下,用 ICl 处理导致
胸苷和 3-取代
胸苷类似物的快速去糖基化、异构化和异构化,导致形成核碱基作为主要产物,伴随着少量形成 α-
呋喃糖苷-、α-
吡喃糖苷-,和β-
吡喃糖苷核苷。另一方面,3,3',5'-三取代的
胸苷类似物仅被去糖基化和异构化。这些结果类似于核苷中糖苷键的酸性
水解所观察到的结果,但可能是由
碘亲电试剂的
路易斯酸特性引起的。