1. Doxifluridine was facilely synthesized from 5-fluorouracil in overall yield of 54.6% via trimethyl silylation, condensation, saponification, ketal formation, iodation, hydrogenolysis and hydrolysis.
   以5-氟尿嘧啶为原料经硅醚化、和四乙酰核糖缩合、皂化、酮缩醇形成、碘化、氢解及水解等反应合成了去氧氟尿苷。本法工艺简便、条件缓和、原料易得、成本低,总收率达54.6
2. Cyanoguanidine and acetylated β-D-ribose were used as starting materials to give target compound via salt formation, cyclization, silylation, coupling reaction and deprotection.
   摘要以氰基胍和甲酸为原料，经成盐、环合反应得到5-氮杂胞嘧啶，5-氮杂胞嘧啶经硅烷化保护后，与乙酰化的核糖成苷，再脱保护基得到氮杂胞苷。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。