Reaction of methyl 5-O-tert-butyldiphenylsilyl-2-deoxy-3-O-p-toluenesulfonyl-α,β-D-erythro-pentofuranoside (2) with silylated uracils 3 using trimethylsilyl trifluoromethanesulfonate (TMS triflate) as catalyst afforded after crystallization in Et2O the corresponding β-nucleosides 4. Reaction of 4 with tetrabutylammonium fluoride (TBAF) or Amberlyst A-26 resin (F--form) in THF at room temperature or at reflux gave the corresponding deprotected 2,3’-anhydro-2’-deoxyuridines 6 and 2’,3’-didehydro-2’,3’-dideoxyuridines 7, respectively.
以
三氟甲磺酸三甲基硅酯(TMS triflate)为催化剂,5-O-叔丁基二苯基
硅烷-2-脱氧-3-O-对
甲苯磺酰基-δ,δ-D-赤式戊
呋喃糖苷(2)与
硅烷基化的尿
嘧啶 3 反应,在 Et2O 中结晶后得到相应的δ-核苷 4。在室温或回流条件下,将 4 与
四丁基氟化铵(TBAF)或 Amberlyst A-26
树脂(F--form)在 THF 中反应,可分别得到相应的去保护的 2,3'-脱氢-
2'-脱氧尿苷 6 和 2',3'-二脱氢-
2',3'-二脱氧尿苷 7。