Studies on antitumor agents. VII. Antitumor activities of O-alkoxyalkyl derivatives of 2'-deoxy-5-trifluoromethyluridine.
作者:JUN-ICHI YAMASHITA、SETSUO TAKEDA、HIROSHI MATSUMOTO、NORIO UNEMI、MITSUGI YASUMOTO
DOI:10.1248/cpb.35.2373
日期:——
Various O-alkoxyalkyl derivatives of 2'-deoxy-5-trifluoromethyluridine (F3Thd) were synthesized, and the antitumor activities of the compounds against sarcoma 180 were examined by oral administration to mice. Among the formal-type derivatives, 3', 5'-di-O-ethoxymethyl (3), 3', 5'-di-O-benzyloxymethyl (12), 5'-O-benzyloxymethyl (13) and 3'-O-benzyloxymethyl (14) compounds showed high activities, which were six-fold higher than that of F3Thd itself. Since acetal-type derivatives were unstable under acidic conditions, antitumor testing of the compounds was also carried out with co-administration of sodium bicarbonate. 5'-O- (1-Ethoxypropyl) -F3Thd (25) and 5'-O- (1-benzyloxypropyl) -F3Thd (37) showed the highest activities among the acetal-type derivatives, but the ED50 values of the compounds were not lower than those of effective formal-type compounds. These O-alkoxyalkyl derivatives of F3Thd are resistant to degradation by thymidine phosphorylase and are activated by microsomal drug-metabolizing enzymes after absorption.
合成了2'-脱氧-5-三氟甲基尿苷(F3Thd)的各种O-烷氧基烷基衍生物,并通过口服给小鼠的方式检测了这些化合物对肉瘤180的抗肿瘤活性。在甲缩醛型衍生物中,3',5'-二-O-乙氧基甲基(3)、3',5'-二-O-苄氧基甲基(12)、5'-O-苄氧基甲基(13)和3'-O-苄氧基甲基(14)化合物显示出高活性,其活性是F3Thd本身的六倍。由于乙缩醛型衍生物在酸性条件下不稳定,还进行了与碳酸氢钠联合给药的抗肿瘤测试。在乙缩醛型衍生物中,5'-O-(1-乙氧基丙基)-F3Thd(25)和5'-O-(1-苄氧基丙基)-F3Thd(37)显示出最高的活性,但其ED50值不低于有效的甲缩醛型化合物。这些F3Thd的O-烷氧基烷基衍生物对胸苷磷酸化酶的降解有抵抗力,在吸收后被微粒体药物代谢酶活化。