A practical synthesis of 3'-O-benzyl-2'-deoxy-5-trifluoromethyluridine (1), a candidate antitumor agent for clinical testing, was developed from 2'-deoxy-5-iodouridine (3). Benzylation of 2'-deoxy-5-iodo-5'-O-trityluridine (14) with benzyl bromide and sodium hydride in tetrahydrofuran gave the 3'-O-derivative (16). Benzoylation of 16 afforded the N3-benzoyl derivative (17). Coupling of 17 with trifluoromethylcopper, prepared from bromotrifluoromethane and copper powder in the presence of 4-dimethylaminopyridine, gave the 5-trifluoromethyl derivative (19) minimally contaminated with the 5-pentafluoroethyl compound. Deprotection of 19 furnished 1.
以 2'-deoxy-5-iodouridine (3) 为原料,开发出了一种实用的 3'-O-benzyl-2'-deoxy-5-trifluoromethyluridine (1) 合成方法,这是一种用于临床测试的候选
抗肿瘤药物。在
四氢呋喃中用
溴化苄基和氢化
钠对 2'-deoxy-5-iodo-5'-O-trityluridine (14) 进行苄基化,得到 3'-O 衍
生物 (16)。16 的苯甲酰化反应得到 N3-苯甲酰基衍
生物 (17)。在 4-二甲
氨基吡啶存在下,用
溴三氟甲烷和
铜粉制备三
氟甲基
铜,将 17 与三
氟甲基
铜偶联,得到 5-三
氟甲基衍
生物(19),该衍
生物受 5-五
氟乙基化合物的污染极小。对 19 进行脱保护处理后得到 1。