Synthesis of 10-Substituted “Open-Chain” Analogues of 5,10-Dideaza-5,6,7,8-tetrahydrofolic Acid (DDATHF, Lometrexol)
作者:Edward C. Taylor、Thomas H. Schrader、Loren D. Walensky
DOI:10.1016/s0040-4020(01)80575-5
日期:1992.1
antimetabolites, structurally based upon our previously described “open-chain” version of DDATHF but carrying 1-carbon substituents in the 10-position, have been synthesized. A key synthetic sequence involving a palladium-catalyzed CC coupling reaction, oxymercuration, and Wittig olefination constitutes a new route to α-branched 4-styrene carboxylic acids. Classical construction of the pyrimidine ring from the
已经合成了几种新颖且非常有效的叶酸抗代谢物,其结构基于我们先前描述的DDATHF的“开链”版本,但在10位带有1个碳取代基。涉及钯催化的CC偶联反应,氧化汞和Wittig烯化反应的关键合成序列构成了制备α-支链4-苯乙烯羧酸的新途径。由关键中间体6进行的嘧啶环的经典构建,接着是谷氨酸偶联,提供了12,在水解时,其提供了10-亚甲基衍生物13。进一步修饰12中的10-亚甲基官能团以提供10-甲基-,10-羟甲基-和10-二羟基硼甲基衍生物22、3和25;双键异构化导致10-甲基-9,10-二氢类似物20。初步的体外细胞培养筛选显示,许多这些“开链”类似物在细胞毒性剂方面可与DDATHF本身竞争,并且其活性是缺少C-10取代基的母体“开链” DDATHF类似物的十倍。然而,令人惊讶的是,化合物13和22在体内是无活性的。