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    • 3. 发明申请
    • METHODS TO MANUFACTURE 1,3-DIOXOLANE NUCLEOSIDES
    • 制备1,3-二氧戊环核苷的方法
    • WO2005074654A2
    • 2005-08-18
    • PCT/US2005003620
    • 2005-02-03
    • UNIV EMORYSZNAIDMAN MARCOSPAINTER GEORGE RALMOND MERRICK RCLEARY DARRYL GPESYAN AMIR
    • SZNAIDMAN MARCOSPAINTER GEORGE RALMOND MERRICK RCLEARY DARRYL GPESYAN AMIR
    • C07D239/47C07D239/54C07D405/04C07D473/16
    • C07D473/16C07D317/34C07D405/04
    • This aplication provides a process for preparing enantiomerically pure beta-D-dioxolane nucleosides. In particular, a new synthesis of (-)-DAPD, suitable for large scale development, is described. In one embodiment the invention provides a process for preparing a substantially pure beta-D or beta-L-1,3-dioxolane nucleosides comprising a) preparing or obtaining an esterified 2,2-dialkoxy ethanol; b) cyclizing the esterified 2,2-dialkoxy ethanol with glycolic acid to obtain a 1,3-dioxolane lactone; c) resolving the 1,3-dioxolane lactone to obtain a substantially pure D- or L-lactone; d) selectively reducing and activating the D-or L-chiral lactone to obtain a substantially pure D- or L-1,3-dioxolane; e) coupling the D- or L-1,3-dioxolane to an activated and/or protected purine or pyrimidine base; and f) optionally purifiying the nucleoside to obtain a substantially pure protected beta-D or beta-L-1,3-dioxolane nucleoside.
    • 该应用提供了制备对映体纯的β-D-二氧戊环核苷的方法。 具体来说,描述了适用于大规模开发的( - ) - DAPD的新合成。 在一个实施方案中,本发明提供了制备基本上纯的β-D或β-L-1,3-二氧戊环核苷的方法,其包括a)制备或获得酯化的2,2-二烷氧基乙醇; b)用乙醇酸环化酯化的2,2-二烷氧基乙醇以获得1,3-二氧戊环内酯; c)分解1,3-二氧戊环内酯以获得基本上纯的D-或L-内酯; d)选择性还原和活化D-或L-手性内酯以获得基本上纯的D-或L-1,3-二氧戊环; e)将D-或L-1,3-二氧戊环偶联到活化和/或保护的嘌呤或嘧啶碱基上; 和f)任选纯化核苷以获得基本上纯的受保护的β-D或β-L-1,3-二氧戊环核苷。