Treatment of 1,3-dioxolane with acetyl bromide gave (2-acetoxyethoxy)methyl bromide (2a) in 88% yield. A number of pyrimidines and three chloropurines were trimethylsilylated and coupled with 2a. The respective N-1 and N-9 alkylated products (obtained in 79–89% yields) were deacetylated to give N-[(2-hydroxyethoxy)methyl] heterocycles. The 6-amino or 6-chloro substituent of the 2-amino-6-substituted-purine derivatives was hydrolyzed smoothly with adenosine deaminase to give 9-[(2-hydroxyethoxy)methyl]guanine (acycloguanosine), the potent antiviral agent.
1,3-二氧杂环戊烷与乙酰溴反应,得到(2-乙酰氧乙氧基)溴甲烷(2a),收率为88%。多种嘧啶和三种氯代嘌呤经过三甲基硅基化处理后与2a偶联。相应的N-1和N-9烷基化产物(收率为79-89%)经去乙酰化处理后得到N-[(2-羟基乙氧基)甲基]杂环化合物。2-氨基-6-取代嘌呤衍生物的6-氨基或6-氯取代基经过腺苷脱氨酶顺利水解,得到9-[(2-羟基乙氧基)甲基]鸟苷(无环鸟苷),这是一种有效的抗病毒药物。