A series of novel acyclic nucleosides. IV. Synthesis of N1-sulfur analogues of acycolvir, directed toward improved antiviral activities.
作者:Chisato KANEKO、Sumiko HARA、Hiroatsu MATSUMOTO、Tadao TAKEUCHI、Takeo MORI、Kazuyoshi IKEDA、Yoshihisa MIZUNO
DOI:10.1248/cpb.39.871
日期:——
Novel imidazothiazine acyclic nucleoside analogues (9a-d, 12a-d and 3c, d) in which N1 of the purine base is replaced by a sulfur atom were synthesized. 5-Substituted imidazo[4, 5-d][1, 3]thiazine-7(3H)-thiones (7a-d) were prepared from 5(4)-substituted amino-4(5)-ethoxycarbonyl-1(3H)-imidazoles with Lawesson reagent and then 7a-d were alkylated with 2-oxa-1, 4-butanediol diacetate or with 2-acetoxyethoxymethyl halide to give 9a-d and 10a, d in moderate yields. Compounds 9a-d were led to the corresponding 7-one derivatives (12a-d) by KMnO4 oxidation. Deprotection of the acetyl group in 9a-d and 12c, d was achieved by means of the Zemplen procedure.
合成了新型咪唑噻嗪无环核苷类似物(9a-d、12a-d 和 3c、d),其中嘌呤碱基的 N1 被一个硫原子取代。用 Lawesson 试剂从 5(4)-取代氨基-4(5)-乙氧基羰基-1(3H)-咪唑制备出 5-取代咪唑并[4, 5-d][1, 3]噻嗪-7(3H)-硫酮(7a-d),然后用 2-氧杂-1, 4-丁二醇二乙酸酯或 2-乙酰氧基乙氧基甲基卤化物对 7a-d 进行烷基化,以中等产率得到 9a-d 和 10a, d。化合物 9a-d 通过 KMnO4 氧化反应生成相应的 7-酮衍生物(12a-d)。9a-d 和 12c, d 中乙酰基的脱保护是通过 Zemplen 程序实现的。