Synthesis and Properties of the Monoesters of 5-Fluorouridine with 4-Carboxybutyric Acid and Their Conjugates with Chitosan.
作者:Hiraku ONISHI、Yoshiharu MACHIDA、Tsuneji NAGAI
DOI:10.1248/cpb.43.340
日期:——
The mixture of 2'-O-(4-carboxybutyryl)-5-fluorouridine (2'-glu-FUR) and 3'-O-(4-carboxybutyryl)-5-fluorouridine (3'-glu-FUR), named (glu-FUR(I)), and 5'-O-(4-carboxybutyryl)-5-fluorouridine (5'-glu-FUR), named glu-FUR(II), were easily obtained from the reaction of 5-fluorouridine (FUR) with glutaric anhydride. In addition, the chitosan-glu-FUR(I) conjugate and the chitosan-glu-FUR(II) conjugate were prepared. The obtained compounds were investigated regarding their in vitro characteristics. Equilibrium between 2'-glu-FUR and 3'-glu-FUR was suggested to be attained quickly in a 1/15 M phosphate buffer of pH 7.4. Glu-FUR(II) was found to be introduced into chitosan more easily than glu-FUR(I). For every compound, chemical hydrolysis was accelerated at weakly basic pH and a gradual regeneration of FUR was observed at physiological pH.
2'-O-(4- 羧基丁酰基)-5-氟尿苷(2'-glu-FUR)和 3'-O-(4- 羧基丁酰基)-5-氟尿苷(3'-glu-FUR)的混合物被命名为(glu-FUR(I))、和 5'-O-(4-羧基丁酰基)-5-氟尿苷(5'-glu-FUR),命名为 glu-FUR(II)。此外,还制备了壳聚糖-glu-FUR(I)共轭物和壳聚糖-glu-FUR(II)共轭物。对所获化合物的体外特性进行了研究。结果表明,在 pH 值为 7.4 的 1/15 M 磷酸盐缓冲液中,2'-glu-FUR 和 3'-glu-FUR 可迅速达到平衡。与 glu-FUR(I)相比,Glu-FUR(II)更容易进入壳聚糖。对于每种化合物,在弱碱性 pH 值下都会加速化学水解,而在生理 pH 值下则会观察到 FUR 的逐渐再生。