Synthesis of 5-Fluorouracil Derivatives Containing an Inhibitor of 5-Fluorouracil Degradation.
作者:Mitsuru HIROHASHI、Masaru KIDO、Yoshihito YAMAMOTO、Yutaka KOJIMA、Koichiro JITSUKAWA、Setsuro Fujii
DOI:10.1248/cpb.41.1498
日期:——
The reactivities of 5-fluorouracil (5-FUra) degradation inhibitors, 2, 4- (2) and 2, 6-dihydroxypyridines (3), were investigated. Acylation of 2 and 2, 4-bis(trimethylsilyloxy)pyridines with equimolar amounts of acid chlorides preferentially occurred at the 4-OH and 2-OH positions, respectively, and the structure of monobenzoylated 5-chloro-2, 4-dihydroxypyridine (2b) was determined as 4-benzoyloxy-5-chloro-2-pyridone (5b) by X-ray crystallo-graphic analysis. Compounds 2 and 3, as well as the N-2-tetrahydrofuryl (11), N-alkyl (12), and N-carbamoyl (14) derivatives of 2, exhibit dynamic keto-enol tautomerism. The acyl derivatives of these pyridines are labile and are thought to be active esters. Monoacyl ester derivatives of these pyridines were combined with 5-FUra analogs to develop novel antitumor agents containing an inhibitor of 5-FUra degradation. One of them, 3-[3-(6-benzoyloxy-3-cyano-2-pyridyloxycarbonyl)benzoyl]-1-ethoxymethyl-5-fluorouracil (BOF-A2) (22b), was the most effective and is currently undergoing late phase-II clinical trials.
研究了 5-氟尿嘧啶(5-FUra)降解抑制剂 2,4-(2)和 2,6-二羟基吡啶(3)的反应活性。2 和 2,4-双(三甲基硅氧基)吡啶分别在 4-OH 和 2-OH 位优先与等摩尔量的酸氯发生酰化反应,通过 X 射线晶体图分析确定单苯甲酰化 5-氯-2,4-二羟基吡啶 (2b) 的结构为 4-苯甲酰基氧基-5-氯-2-吡啶酮 (5b)。化合物 2 和 3 以及 2 的 N-2-四氢糠基(11)、N-烷基(12)和 N-氨基甲酰基(14)衍生物表现出动态的酮烯醇同分异构现象。这些吡啶的酰基衍生物具有易变性,被认为是活性酯。这些吡啶的单酰基酯衍生物与 5-FUra 类似物相结合,开发出了含有 5-FUra 降解抑制剂的新型抗肿瘤药物。其中,3-[3-(6-苯甲酰氧基-3-氰基-2-吡啶氧羰基)苯甲酰]-1-乙氧基甲基-5-氟尿嘧啶(BOF-A2)(22b)最为有效,目前正在进行第二阶段后期临床试验。