6-Azauracil or 8-aza-7-deazaadenine nucleosides and oligonucleotides: the effect of 2′-fluoro substituents and nucleobase nitrogens on conformation and base pairing
作者:Frank Seela、Padmaja Chittepu
DOI:10.1039/b715512c
日期:——
The stereoselective syntheses of 6-azauracil- and 8-aza-7-deazaadenine 2'-deoxy-2'-fluoro-beta-d-arabinofuranosides and employing nucleobase anion glycosylation with 3,5-di-O-benzoyl-2-deoxy-2-fluoro-alpha-d-arabinofuranosyl bromide as the sugar component are described; the 6-azauracil 2'-deoxy-2'-fluoro-beta-d-ribofuranoside was prepared from 6-azauridine via the 2,2'-anhydro intermediate and transformation
立体选择性合成6-氮杂嘧啶和8-氮杂-7-脱氮杂腺嘌呤2'-脱氧-2'-氟-β-d-阿拉伯呋喃糖苷,并用3,5-二-O-苯甲酰基-2-脱氧核苷阴离子糖基化描述了作为糖组分的-2-氟-α-d-阿拉伯呋喃糖基溴化物;6-氮杂尿嘧啶2'-脱氧-2'-氟-β-d-呋喃核糖苷是由6-氮杂尿苷经2,2'-脱水中间体并用DAST转化糖而制得的。化合物显示优选的N构象异构体群体(N为100%,N为78%)与不包含2'-位氟原子和紧靠糖基化位点的氮的组合的核苷完全不同。寡核苷酸掺入和合成使用亚磷酰胺和亚磷酰胺。