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CN106831740B 一种恩曲他滨中间体的制备工艺 有权

一种恩曲他滨中间体的制备工艺
摘要：
本发明公开了一种恩曲他滨中间体——结构如式1所示的(2R,5S)‑5‑(5’‑氟‑胞嘧啶‑1‑基)‑1,3‑氧硫杂环戊烷‑2‑羧酸‑L‑薄荷基酯的制备工艺，该制备工艺包括：(A)以结构如式7所示的5‑氟胞嘧啶为原料，经与结构如式20所示的N,N‑二甲基甲酰胺、结构如式8所示的六甲基二硅氮烷反应制备结构如式21所示的2‑O‑三甲硅基‑4‑N‑[(N’,N’‑二甲基)氨基]亚甲基‑5‑氟胞嘧啶；(B)化合物21与结构如式6所示的氯代物缩合制得结构如式22所式的(2R,5S)‑5‑[4’‑N‑((N’,N’‑二甲基)氨基)亚甲基‑5’‑氟‑胞嘧啶‑1‑基]‑1,3‑氧硫杂环戊烷‑2‑羧酸‑L‑薄荷基酯；(C)化合物22在酸性溶液中水解，制得化合物1。本发明工艺过程能够减少副反应，从而提高产物纯度，降低原料消耗。
摘要（英）：

The invention discloses a preparation process of an emtricitabine intermediate, namely (2R,5S)-5-(5'-fluoro-cytosine-1-yl)-1,3-dioxathiolane-2-carboxylic acid-L-menthyl ester shown as a structural formula (I). The preparation process comprises the following steps: (A) taking 5-fluorocytosine shown as a structural formula 7 as a raw material, and enabling the 5-fluorocytosine to react with N,N-dimethylformamide shown as a structural formula 20 and hexamethyldisilazane shown as a structural formula 8 to prepare 2-O-trimethylsilyl-4-N-[(N',N'-dimethyl)amino]methylene-5-fluorocytosine shown as a structural formula 21; (B) condensing the compound 21 and a chlorine substitute shown as a structural formula 6 to generate (2R,5S)-5-(4'-N-((N',' dimethyl)amino)methylene-5'-fluoro-cytosine-1-yl)-1,3-dioxathiolane-2-carboxylic acid-L-menthyl ester shown as a structural formula 22; and (C) hydrolyzing the compound 22 in an acidic solution to prepare the compound I. According to the preparation process, side reaction can be reduced so that the purity of a product is improved and the consumption of raw materials is reduced. The formula (I) is as shown in the specification.

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