Two series of N4-hydroxycytidine derivatives were synthesized and evaluated as potential antipox virus agents. Acylation of N4-hydroxycytidine (1) with an excess of acyl chloride or imidazolide yielded the corresponding N4-(acyloxy) derivatives. 5'-Phosphonates of 1 were prepared by the reaction of cytidine 5'-phosphonates with aqueous hydroxylamine hydrochloride (pH 6.0). Nucleoside 1 and its N4-(acyloxy) derivatives inhibited replication of pox viruses in cell cultures, N4-(pivaloyloxy)- and N4-(benzoyloxy)cytidines being the most potent. The synthesized 5'-phosphonates were more cytotoxic than the parent nucleoside.
合成了两系列N^4-羟基胞嘧啶衍生物,并作为潜在的抗痘病毒药物进行评价。N^4-羟基胞嘧啶(1)与过量的酰氯或咪唑酰化合物反应,生成相应的N^4-(酰氧基)衍生物。通过胞嘧啶5'-磷酸酯与水合氯化羟胺(pH 6.0)反应制备了1的5'-磷酸酯。核苷1及其N^4-(酰氧基)衍生物抑制了细胞培养中痘病毒的复制,其中N^4-(戊酰氧基)和N^4-(苯甲酰氧基)胞嘧啶具有最强的抑制作用。合成的5'-磷酸酯比母核苷更具细胞毒性。