The synthesis of 3’-deoxy-3’-difluoromethyluridine (9) and 2’-deoxy-2’-difluoromethyluridine (7β) by hydrogenation of the corresponding difluoromethylene derivatives is described. A second synthesis of the latter has been performed. Starting from thymidine, a two-step procedure affords the benzylated furanoid glycal 12. Addition of dibromodifluoromethane gives the α-2’-deoxy-2’-bromodifluoromethylarabinose (13). This compound allowed an access to α- or β -2’-deoxy-2’-difluoromethyluridine via a SN2 type reaction on a α-halodeoxyarabinose species.
介绍了通过氢化相应的二
氟亚甲基衍
生物合成 3'-deoxy-3'-difluoromethyluridine (9) 和 2'-deoxy-2'-difluoromethyluridine (7δ²)。对后者进行了第二次合成。从胸腺
嘧啶开始,通过两步程序得到了苄基
呋喃糖醛 12。加入
二溴二氟甲烷可得到δ-2'-脱氧-2'-
溴二
氟甲基
阿拉伯糖(13)。这种化合物可以通过 δ-卤代脱氧
阿拉伯糖的 SN2 型反应获得 δ- 或 δ² -2'-脱氧-2'-二
氟甲基
尿苷。