Unsaturated fluoro-ketopyranosyl nucleosides: Synthesis and biological evaluation of 3-fluoro-4-keto-β-d-glucopyranosyl derivatives of N4-benzoyl cytosine and N6-benzoyl adenine
作者:Stella Manta、George Agelis、Tanja Botić、Avrelija Cencič、Dimitri Komiotis
DOI:10.1016/j.ejmech.2007.04.001
日期:2008.2
adenine, respectively. The nucleosides were deacetylated and several subsequent protection and deprotection steps afforded the partially acetylated nucleosides of cytosine 7a and adenine 7b, respectively. Finally, direct oxidation of the free hydroxyl group at 4'-position of 7a and 7b, and simultaneous elimination reaction of the beta-acetoxyl group, afforded the desired unsaturated 3-fluoro-4-keto-beta-d-glucopyranosyl
受保护的β-核苷1-(2,4,6-三-O-乙酰基3-脱氧-3-氟-β-d-吡喃葡萄糖基)-N(4)-苯甲酰基胞嘧啶(2a)和9-(2通过过乙酰化的3-脱氧-3-偶联反应合成了(4,6-三-O-乙酰基-3-脱氧-3-氟-β-d-吡喃葡萄糖基)-N(6)-苯甲酰基腺嘌呤(2b)。氟-d-吡喃葡萄糖(1)分别被甲硅烷基化的N(4)-苯甲酰基胞嘧啶和N(6)-苯甲酰基腺嘌呤所取代。核苷被脱乙酰,随后的几个保护和脱保护步骤分别提供了胞嘧啶7a和腺嘌呤7b的部分乙酰化的核苷。最后,在7a和7b的4′-位上的游离羟基的直接氧化,和β-乙酰氧基的同时消除反应,得到所需的不饱和3-氟-4-酮-β-d-吡喃葡萄糖基衍生物。对这些新合成的化合物的潜在抗肿瘤和抗病毒活性进行了评估。与5FU相比,新合成的衍生物显示出更有效的抗肿瘤生长抑制剂,并且对轮状病毒表现出直接的抗病毒作用。