Disclosed is the preparation of 2-deoxy-D-erythro-2,2-difluororibofuranose-3,5-dibenzoate:
a known intermediate for the preparation of Gemcitabine, by means of a reduction process; further disclosed is the purification of Gemcitabine by chromatography and the purification of Gemcitabine hydrochloride by crystallization techniques from ternary solvent mixtures. The main advantage of the invention is providing Gemcitabine hydrochloride with purity in conformity with the Pharmacopoeia requirements, as well as a process particularly convenient from the industrial point of view.
                            揭示了2-脱氧-D-赤霉糖-2,2-二
氟核糖呋喃糖酸酯的制备方法:
通过还原过程制备
吉西他滨的已知中间体;进一步揭示了通过色谱法纯化
吉西他滨以及通过结晶技术从三元溶剂混合物中纯化
吉西他滨盐酸盐的方法。该发明的主要优点是提供符合药典要求纯度的
吉西他滨盐酸盐,以及从工业角度特别方便的工艺。