Regioselective Syntheses of 7-Halogenated 7-Deazapurine Nucleosides Related to 2-Amino-7-deaza-2′-deoxyadenosine and 7-Deaza-2′-deoxyisoguanosine
作者:Frank Seela、Xiaohua Peng
DOI:10.1055/s-2004-822382
日期:——
The syntheses of 7-halogenated derivatives 3b-e of 2-amino-7-deaza-2'-deoxyadenosine as well as 7-bromo and 7-chloro-7-deaza-2'-deoxyisoguanosines 4b-c are described. Nucleobase anion glycosylation was employed for the convergent nucleoside synthesis. The regioselective 7-halogenation was performed either on the nucleoside precursor 7 or on the nucleobase 12. Two bromo substituents were introduced
描述了 2-氨基-7-deaza-2'-deoxyadenosine 以及 7-bromo 和 7-chloro-7-deaza-2'-deoxyisoguanosines 4b-c 的 7-卤代衍生物 3b-e 的合成。核碱基阴离子糖基化用于聚合核苷合成。在核苷前体 7 或核碱基 12 上进行区域选择性 7-卤化。当使用未保护的 2-氨基核苷 9 时,在 7 位和 8 位引入了两个溴取代基。核苷 3a-e 和 4a-c 的糖部分的构象分析基于邻位 1 H、 1 H NMR 偶联常数进行。