Synthesis of 2′- and 3′-azido-2′,3′-dideoxyadenosines. Preparative applications of the deoxygenative [1,2]-hydride shift and β-elimination reactions of O-sulfonylated adenosines
作者:Masajiro Kawana、Hiroyoshi Kuzuhara
DOI:10.1016/0008-6215(89)84088-1
日期:1989.6
Abstract 2′-Azido-2′,3′-dideoxyadenosine ( 9 ) has been synthesized from adenosine ( 1 ) in 6–8 steps. The key intermediate, N 6 , O 5′ -bis(4,4′-dimethoxytrityl)-9-(3-deoxy-β- d - threo -pentofuranosyl)adenine ( 6a ), was prepared in a one-flask manner by two methods, (a) in 95% yield by a deoxygenative [1,2]-hydride shift of a 3′- O -mesyl-adenosine derivative ( 5e ) and subsequent reduction of an
摘要由腺苷(1)以6–8步合成了2'-Azido-2',3'-二脱氧腺苷(9)。通过以下方法以一烧瓶的方式制备关键中间体N 6,O 5'-双(4,4'-二甲氧基三苯甲基)-9-(3-脱氧-β-d-苏-戊呋喃糖基)腺嘌呤(6a)。两种方法,(a)通过3'-O-甲磺酰基-腺苷衍生物(5e)的脱氧[1,2]-氢化物转移和随后还原原位生成的2'-酮衍生物(95)的收率达到95% 10)与Mg(OMe)2 -NaBH 4混合试剂;(b)通过消除N 6,O 5'-双(4,4'-二甲氧基三苯甲基)-3'-O-甲磺酰基-2'-O-甲苯磺酰基-和-2',3'-二-O-甲苯磺酰基腺苷(5b和5c)形成烯醇甲苯磺酸酯(11),将其以良好的产率转化为6a。在这些反应中,可以使用KOH代替Mg(OMe)2。在消除β之前,5b的2'-脱甲苯基化发生了一定程度(约30%)。通过使用第一步骤和第二步骤,从1得到的9的总产