Pyrimidine derivatives and related compounds. XLIX. Reaction of anhydrouridines with the Vilsmeier reagent.
作者:KOSAKU HIROTA、YUKIO KITADE、FUMIAKI IWAMI、SHIGEO SENDA
DOI:10.1248/cpb.32.2591
日期:——
Treatment of O2, 2'-anhydrouridine (1) with phosphorus oxychloride in dimethylformamide (DMF) at 60°C afforded both 2', 5'-dichloro-2', 5'-dideoxyuridine (2a) and 2', 5'-dichloro-2', 5'-dideoxy-3'-O-formyluridine (3a). The reaction of 1 with phosphorus oxybromide in DMF gave the corresponding 2', 5'-dibromo derivatives (2b) and (3b). O2, 5'-Anhydro-2', 3'-O-isopropylideneuridine (4) was treated with the Vilsmeier reagent (DMF/POX3) to give the corresponding 5'-halogeno-5'-deoxy-2', 3'-O-isopropylideneuridines (5a and 5b) in high yields. Under the same conditions, the reaction of 6, 5'-cyclo-2', 3'-O-isopropylideneuridine (6) with the Vilsmeier reagent (DMF/POX3) afforded the corresponding 1-(5-halogeno-5-deoxy-2, 3-O-isopropylidene-β-D-ribofuranosyl)-5-dimethylaminomethylenebarbituric acids (7a and 7b) in high yields.
在 60°C 的二甲基甲酰胺(DMF)中用氧氯化磷处理 O2,2'-脱水尿苷 (1),可得到 2',5'-二氯-2',5'-二脱氧尿苷 (2a) 和 2',5'-二氯-2',5'-二脱氧-3'-O-甲酰基尿苷 (3a)。1 在 DMF 中与氧溴化磷反应生成相应的 2',5'-二溴衍生物 (2b) 和 (3b)。用 Vilsmeier 试剂(DMF/POX3)处理 O2、5'-脱氢-2'、3'-O-异亚丙基尿苷 (4),可以高产率得到相应的 5'-卤代-5'-脱氧-2'、3'-O-异亚丙基尿苷 (5a 和 5b)。在相同条件下,6, 5'-环-2', 3'-O-异亚丙基尿苷(6)与 Vilsmeier 试剂(DMF/POX3)反应,高产率地得到了相应的 1-(5-卤代-5-脱氧-2, 3-O-异亚丙基-β-D-呋喃核糖基)-5-二甲基氨基亚甲基巴比妥酸(7a 和 7b)。