1-[(S)-3-Hydroxy-2-(phosphonomethoxy)propyl]cytosine (HPMPC, cidofovir) was modified by substitution on the base moiety in positions C-5 andN4. Key intermediates of these syntheses, diisopropyl esters of (S)-1-[2-(phosphonomethoxy)-3-(triphenylmethoxy)propyl]-5-alkylcytosines (6and7) prepared from 5-alkyl-4-methoxypyrimidin-2(1H)-ones were transformed to the corresponding 5-substituted cytosine orN4-alkylcytosine derivatives by the action of ammonia or primary amines, respectively. These fully protected phosphonate esters gave by treatment with bromotrimethylsilane followed by hydrolysis free phosphonic acids: 1-[(S)-3-hydroxy-2-(phosphonomethoxy)propyl]-5-methylcytosine (5-methyl-HPMPC,10), 5-ethyl-1-[(S)-3-hydroxy-2-(phosphonomethoxy)propyl]cytosine (5-ethyl-HPMPC,11) and a series of 5-ethyl-HPMPC analogues17-21bearing various substituents inN4position (cyclopropyl, cyclopentyl, 2-hydroxyethyl, allyl, 2-(dimethylamino)ethyl). 5-Ethynyl-1-[(S)-3-hydroxy-2-(phosphonomethoxy)propyl]cytosine (5-ethynyl-HPMPC,26) was prepared from 5-iodocytosine derivative23using Sonogashira coupling with (trimethylsilyl)acetylene, CuI and [PdCl2(Ph3P)2]. None of the prepared compounds exhibited antiviral activity in vitro.
1-[(S)-3-羟基-2-(
磷酸甲氧基)丙基]
胞苷(H
PMPC,
西多福韦)在C-5和N4位置上对碱基部分进行了取代修饰。这些合成的关键中间体,即(
)-1-[2-(磷酸甲氧基)-3-(三苯甲氧基)丙基]-5-烷基胞嘧啶(6和7)的二异丙酯,是由5-烷基-4-甲氧基嘧啶-2(1H)-酮制备而成,通过氨或一级胺的作用分别转化为相应的5-取代胞嘧啶或N4-烷基胞嘧啶衍生物。这些完全保护的磷酸酯经溴三甲基硅烷处理后,随后经水解得到自由磷酸:1-[(S)-3-羟基-2-(磷酸甲氧基)丙基]-5-甲基胞嘧啶(5-甲基-HPMPC,10),5-乙基-1-[(S)-3-羟基-2-(磷酸甲氧基)丙基]胞嘧啶(5-乙基-HPMPC,11)和一系列带有各种N4位置取代基(环丙基,环戊基,2-羟乙基,烯丙基,2-(二甲基氨基)乙基)的5-乙基-HPMPC类似物17-21。5-乙炔基-1-[(S)-3-羟基-2-(磷酸甲氧基)丙基]胞嘧啶(5-乙炔基-HPMPC,26)是由5-碘胞嘧啶衍生物23通过Sonogashira偶联与(三甲基硅基)乙炔,CuI和[PdCl2(Ph3P)2]制备的。所有制备的化合物均未在体外显示抗病毒活性。