申请人:Storer Richard
公开号:US20050059632A1
公开(公告)日:2005-03-17
An improved process for the preparation of 2′-modified nucleosides and 2′-deoxy-nucleosides, such as, β-L-2′-deoxy-thymidine (LdT), is provided. In particular, the improved process is directed to the synthesis of a 2′-deoxynucleoside that may utilize different starting materials but that proceeds via a chloro-sugar intermediate or via a 2,2′-anhydro-1-furanosyl-nucleobase intermediate. Where an 2,2′-anhydro-
1
-furanosyl base intermediate is utilized, a reducing agent, such as Red-Al, and a sequestering agent, such as 15-crown-5 ether, that cause an intramolecular displacement reaction and formation of the desired nucleoside product in good yields are employed. An alternative process of the present invention utilizes a 2,2′-anhydro-1-furanosyl base intermediate without a sequestering agent to afford 2′-deoxynucleosides in good yields. The compounds made according to the present invention may be used as intermediates in the preparation of other nucleoside analogues, or may be used directly as antiviral and/or antineoplastic agents.
提供了一种改进的制备2'-修饰核苷和2'-脱氧核苷的方法,例如β-L-2'-脱氧胸腺嘧啶(LdT)。具体而言,改进的方法是针对合成2'-脱氧核苷,可以利用不同的起始材料,但是通过氯代糖中间体或通过2,2'-脱水基-1-呋喃糖基-核碱中间体进行。当使用2,2'-脱水基-1-呋喃糖基中间体时,使用还原剂(例如Red-Al)和隔离剂(例如15-冠-5醚),引起分子内位移反应并以良好的产率形成所需的核苷产物。本发明的另一种替代方法利用2,2'-脱水基-1-呋喃糖基中间体,不使用隔离剂,以良好的产率得到2'-脱氧核苷。根据本发明制备的化合物可以用作其他核苷类似物的中间体,也可以直接用作抗病毒和/或抗肿瘤剂。