Nucleosides. II. Direct synthesis of 5-substituted 2',5'-anhydro-1-.BETA.-D-arabinofuranosyluracils from uridine derivatives.
作者:KOSAKU HIROTA、YUKIO KITADE、TETSUO TOMISHI、YOSHIFUMI MAKI
DOI:10.1248/cpb.33.4212
日期:——
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。