Reaction of 5-substituted 2', 5'-dichloro-2', 5'-dideoxyuridines (1a-d) with methanolic sodium hydroxide under reflux afforded the corresponding 5-substituted 2', 5'-anhydro-1-β-D-arabino-furanosyluracils (3a-d) in high yield. On the other hand, reaction of 5-substituted uridines (5a-d) with the Vilsmeier-Haack reagent (POCl3/DMF) followed by treatment with methanolic sodium hydroxide under reflux led directly to the formation of the corresponding anhydrouridines (3a-d) in good yield.
在回流条件下,5-取代的 2',5'-二
氯-
2',5'-二脱氧尿苷(1a-d)与
甲醇氢氧化钠反应,可以得到相应的 5-取代的 2',5'-脱
水-1-β-D-阿拉伯
呋喃糖基尿
嘧啶(3a-d),产率很高。另一方面,5-取代的
尿苷 (5a-d) 与 Vilsmeier-Haack 试剂(POCl3/
DMF)反应,然后在回流条件下用
甲醇氢氧化钠处理,可直接生成相应的无
水尿苷 (3a-d),收率很高。