respectively. These protected nucleosides and the 3′-azido-3′-de-oxythymidine (6) reacted with newly synthesized and properly characterized lipid-phosphoramidites 21–25, catalyzed by 1H-tetrazole, to the corresponding nucleoside-phospholipid conjugates 26–38 in high yield. The deprotection was accomplished via β-elimination with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in aprotic solvents to give analytically
将改进的亚
磷酰胺策略用于使用β-消除保护基团合成寡核苷酸到
磷脂化学中的应用为合成AZT(6)和
虫草素的
磷脂结合物提供了可能性。3'-
叠氮基-3'-脱氧胸腺
嘧啶核苷(6)的合成是通过一种新的分离方法完成的,无需色谱纯化步骤,总产率为50%。保护
虫草素(= 3'-脱oxyadenosine)衍
生物,该Ñ 6,2,2'-双[2-(4-
硝基苯基)乙氧基羰基]
虫草素(12)和所述Ñ 6,5'-双[2-(4-
硝基苯]乙氧基羰基] cordycepin(13)通过已知方法制备,并直接将N酰化6- [2-(4-
硝基苯基)乙氧基羰基] cordycepin(9)。这些受保护的核苷和3'-
叠氮基-3'-脱oxythymidine(6)与反应新合成的和正确表征的脂质-亚
磷酰胺21-25,由1个催化ħ
四唑,为相应的核苷的缀合物的
磷脂26-38高产。脱保护作用是通过在质子惰性溶剂中用
1,8-二氮杂双环[5.4.0]