Synthesis of Nucleosides through Direct Glycosylation of Nucleobases with 5-<i>O</i>-Monoprotected or 5-Modified Ribose: Improved Protocol, Scope, and Mechanism
作者:A. Michael Downey、Radek Pohl、Jana Roithová、Michal Hocek
DOI:10.1002/chem.201604955
日期:2017.3.17
Simplifying access to synthetic nucleosides is of interest due to their widespread use as biochemical or anticancer and antiviral agents. Herein, a direct stereoselective method to access an expansive range of both natural and synthetic nucleosides up to a gram scale, through direct glycosylation of nucleobases with 5‐O‐tritylribose and other C5‐modified ribose derivatives, is discussed in detail.
由于合成核苷广泛用作生化或抗癌和抗病毒剂,因此简化对合成核苷的获取备受关注。本文介绍了一种直接立体选择性方法,可通过将核碱基与5- O-三苯甲基核糖和其他C的直接糖基化作用,以达到克级的广泛范围的天然和合成核苷详细讨论了5-修饰的核糖衍生物。反应在改良的Mitsunobu反应条件下通过原位形成的1,2-脱水糖(称为“脱水酶”)的亲核环氧化物开环进行。描述了合成多种核苷和其他1取代核糖苷衍生物时的反应范围。另外,提供了对该关键糖基供体中间体形成的机理的见解。