[EN] PROCESS FOR THE PREPARATION OF GEMCITABINE HYDROCHLORIDE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE CHLORHYDRATE DE GEMCITABINE
申请人:KARIMIAN KHASHAYAR
公开号:WO2016097989A1
公开(公告)日:2016-06-23
The present invention relates to an improved as well as an industrially viable process for the preparation of 2'-deoxy-2',2'-difluorocytidine and its pharmaceutical acceptable acid salts thereof in high purity and acceptable yield by using a simple and inexpensive process. The process involves reacting an alpha anomer enriched 2'-deoxy-2',2'-difluorocarbohydrate with silylated nucleobase derivatives via the SN2 displacement of an anomeric sulfonyloxy group in an inert solvent to produce 2',2'-difluoro-2'-deoxycytidine-3',5'-dibenzoate in about a 5:1 β/α anomeric ratio, and a process for selectively isolating β-2',2'-difluoro-2'-deoxycytidine-3',5'- dibenzoate from the 5:1 β/α anomeric mixture. The pure β-2',2'-difluoro-2'- deoxycytidine-3',5'-dibenzoate is then converted to the corresponding nucleoside utilizing ammonium hydroxide in a polar and preferably protic solvent to obtain β- 2'-deoxy-2',2'-difluorocytidine, which is thereafter converted to gemcitabine hydrochloride that is effective against non-small cell lung cancer, pancreatic cancer, bladder cancer and breast cancer. The present invention relates to an improved and convenient method for preparing antineoplastic nucleosides, more particularly, a process for preparing gemcitabine hydrochloride, represented by the formula I below, which exhibits good antitumor activity. (I)
本发明涉及一种改进的以及在工业上可行的过程,用于制备高纯度和可接受产率的2'-去氧-2',2'-二氟胞苷及其药用可接受的酸盐,通过使用简单且廉价的过程。该过程涉及将富含α异构体的2'-去氧-2',2'-二氟碳水化合物与硅化核碱衍生物反应,通过在惰性溶剂中进行SN2取代反应,以产生大约5:1 β/α异构比例的2',2'-二氟-2'-去氧胞苷-3',5'-二苯甲酸酯,并且涉及一种从5:1 β/α异构混合物中选择性地分离β-2',2'-二氟-2'-去氧胞苷-3',5'-二苯甲酸酯的过程。然后,将纯的β-2',2'-二氟-2'-去氧胞苷-3',5'-二苯甲酸酯转化为相应的核苷,利用氢氧化铵在极性并最好是质子溶剂中获得β-2'-去氧-2',2'-二氟胞苷,随后将其转化为对非小细胞肺癌、胰腺癌、膀胱癌和乳腺癌有效的盐酸吉西他滨。本发明涉及一种改进的和方便的制备抗肿瘤核苷的方法,更具体地说,涉及一种制备对应于下面式I的盐酸吉西他滨的过程,该化合物展现出良好的抗肿瘤活性。