Aromatic Nonpolar Nucleosides as Hydrophobic Isosteres of Pyrimidines and Purine Nucleosides
作者:Barbara A. Schweitzer、Eric T. Kool
DOI:10.1021/jo00103a013
日期:1994.12
afforded the two β-C-nucleoside pyrimidine analogs 1 and 2. The dimethylindolyl nucleoside 3, a purine isostere, was obtained by a nucleophilic displacement on α-chlorodeoxyribofuranose by the sodium salt of 4,6-dimethylindole, followed by deprotection. Regio- and stereochemistry of the products were established with NOE difference spectra and (1)H NMR splitting patterns. Analogs 1 and 2 are nonpolar isosteres
描述了三种非极性核苷等排体的设计、合成和结构,用作 DNA 中非共价键的探针和设计的核酸结构中天然核苷的等排置换。取代的芳基格氏与 3',5'-双-O-甲苯酰-α-脱氧呋喃异戊酰氯反应,随后用甲醇钠在甲醇中脱保护,得到两个 β-C-核苷嘧啶类似物 1 和 2。二甲基吲哚基核苷 3,a嘌呤等排体是通过 4,6-二甲基吲哚的钠盐对 α-氯代脱氧呋喃核糖进行亲核置换,然后去保护而获得的。产物的区域和立体化学通过 NOE 差异光谱和 (1) H NMR 分裂模式建立。类似物 1 和 2 是胸苷的非极性等排体,核苷 3 是 2-氨基脱氧腺苷的等排体,它是胸苷的三重键沃森-克里克搭档。进行了半经验 AM1 计算以提供键长信息,以评估等排体与其天然对应物之间的结构相似性。