Synthesis of a Bicyclic Analogue of AZT Restricted in an Unusual O4‘-<i>Endo</i> Conformation
作者:Marianne H. Sørensen、Claus Nielsen、Poul Nielsen
DOI:10.1021/jo010299j
日期:2001.7.1
beta-nucleoside analogue 5 has been designed as a conformationally restricted analogue of the anti-HIV drug AZT. The synthesis of 5 as well as its alpha-anomer 29 is hereby described. The synthesis was accomplished from D-arabinose via a modified Corey-Link procedure stereoselectively incorporating the azide moiety as well as a methyl ester function. When the tert-butyldiphenylsilyl group was used as a permanent
[3.2.0]双环β-核苷类似物5已被设计为抗HIV药物AZT的构象受限类似物。因此描述了5及其α-端基异构体29的合成。由D-阿拉伯糖通过改良的Corey-Link程序完成立体合成,该程序立体选择性地合并了叠氮化物部分以及甲酯功能。当叔丁基二苯基甲硅烷基用作永久保护基时,氧杂环丁烷环的选择性形成失败。当使用对甲氧基苯基作为永久保护基时,通过酯的选择性还原,核碱基偶联,随后的端基异构体的分离和闭环程序有效地获得了5和29。核苷5在构型上受限于异常的O4'-内(东)构象,这是北方型和南方型构象之间的中间产物。然而,5和29均未显示出任何抗HIV活性。