申请人:Eli Lilly and Company
公开号:US06001994A1
公开(公告)日:1999-12-14
An improved process to make gemcitabine hydrocrhloride, the improvement consisting essentially of making the lactone intermediate, 2-deoxy-2,2-difluoro-D-erythro-pentafuranose-1 ulose-3,5-dibenzoate: ##STR1## from D-erythro-2-Deoxy-2,2-difluoro 4,5-O-(1-ethylpropyl)-idene) pentoic acid tert Butyl ester wherein, the D-erythro-2-deoxy-2,2 difluoro-4,5-O-(1-ethylproyl)-ideno) pentoic acid tert-Butyl ester is prepared by the process of reacting S-tert-butyl difluoroethane thioate with 2,3-O (1-ethylpropylidene)-D-glyceraldehyde, in a solvent and in the presence of a strong base; with the proviso that the process is conducted in the absence of a catalyst and in the absence of a silyl containing compound.
一种改进的制备吉西他滨盐酸盐的工艺,其改进主要包括制备内酯中间体2-脱氧-2,2-二氟-D-赤霉糖-1-乌洛酯-3,5-二苯酸酯:##STR1##从D-赤霉糖-2-脱氧-2,2-二氟-4,5-O-(1-乙基丙基)-亚甲基)戊酸叔丁酯中制备,其中,D-赤霉糖-2-脱氧-2,2-二氟-4,5-O-(1-乙基丙基)-亚甲基)戊酸叔丁酯是通过在溶剂和强碱存在下将S-叔丁基二氟乙烷硫酸酯与2,3-O-(1-乙基丙基亚甲基)-D-甘油醛反应制备的;但要注意,该工艺在无催化剂和无硅基含物的情况下进行。