observed by the bovine brain guanylate kinase. Since all isosteric analogues of PMEG (7-9) were not inhibitory against HSV-1 and HSV-2, the presence of the 3'-oxygen atom in the PME purines proved critical for anti-HSV activity. Introduction of the 1'-methyl group on the PMEG side chain significantly reduced its anti-HSV activity. Analogue 11, which is a mimic of the phosphate by incorporation of the alpha
合成了一系列9-(膦酰基烷基)
嘌呤,它们是9- [2-(膦酰基甲氧基)乙基]
嘌呤的类似物(
鸟嘌呤,P
MEG,1;
腺嘌呤,P
MEA,2)。测试了类似物对1型和2型单纯疱疹病毒(HSV-1和HSV-2),人巨细胞病毒(HCMV),罗氏鼠白血病病毒(R-MuLV)和1型人类免疫缺陷病毒(HIV-1)的活性)。随着烷基链长度的变化,
嘌呤碱和膦酰基甲氧基官能团之间有两个碳原子,从而实现了最佳活性。尽管与P
MEG的结构相似且pKa2值接近8,但牛脑
鸟苷酸激酶未观察到8的
磷酸化。由于所有P
MEG的等距类似物(7-9)均不能抑制HSV-1和HSV-2,因此存在3' PME
嘌呤中的-氧原子被证明对抗HSV活性至关重要。在P
MEG侧链上引入1'-甲基会大大降低其抗HSV活性。通过掺入α,α-二
氟碳来模拟
磷酸盐的类似物11对HSV-1和HSV-2无效。这些结果表明,PME
嘌呤的抗HSV活性的结构要求似乎非常严格。