7-Substituted 7-Deaza-2?-deoxyguanosines: Regioselective Halogenation of Pyrrolo[2,3-d]pyrimidine Nucleosides
作者:Natalya Ramzaeva、Frank Seela
DOI:10.1002/hlca.19950780505
日期:1995.8.9
The synthesis of 7-chloro-, 7-bromo-, and 7-iodo-substituted 7-deaza-2′-deoxyguanosine derivatives 2b–d is described. The regioselective 7-halogenation with N-halogenosuccinimides was accomplished using 7-[2-deoxy-3,5-O-di(2-methylpropanoyl)-β-D-erythro- pentofuranosyl]-2-(formylamino)-4-methoxy-7H-pyrrolo[2,3-d]- pyrimidine (4) as the common precursor. A one-pot reaction (2N aq. NaOH) of the halogenated
描述了7-氯,7-溴和7-碘取代的7-脱氮基2'-脱氧鸟苷衍生物2b – d的合成。使用7- [2-脱氧-3,5- O-二(2-甲基丙酰基)-β-D-赤型-戊呋喃糖基] -2-(甲酰氨基)-4-甲氧基完成N-卤代琥珀酰亚胺的区域选择性7-卤代反应-7 H-吡咯并[2,3- d ]-嘧啶(4)为常见的前体。卤化中间体5a – c的一锅反应(2N NaOH水溶液)提供了所需的化合物。还描述了7-脱氮基2'-脱氧鸟苷的7-己炔基衍生物2e。