Synthesis of Methylene- and Difluoromethylenephosphonate Analogues of Uridine-4-phosphate and 3-Deazauridine-4-phosphate
作者:Scott D. Taylor、Farzad Mirzaei、Ali Sharifi、Stephen L. Bearne
DOI:10.1021/jo0617666
日期:2006.12.1
compound 3, was achieved by ribosylation of protected 4-(phosphonomethyl)-2-hydroxypyridine. Electrophilic fluorination was also employed in the preparation of protected 4-(phosphonodifluoromethyl)-2-hydroxypyridine which was used as the key building block in the synthesis of difluoro derivative 4. These compounds represent the first examples of a nucleoside in which the base has been chemically modified
胞苷三磷酸合成酶(CTPS)催化由谷氨酰胺,尿苷5'-三磷酸(UTP)和腺苷5'-三磷酸形成胞苷三磷酸。CTPS抑制剂作为治疗剂具有潜力,因此受到关注。一种有效的酶抑制剂的方法是使用反应过程中形成的高能中间体的类似物。CTPS反应通过高能中间体UTP-4-磷酸盐(UTP-4-P)进行。合成了尿苷-4-磷酸(U-4-P)和3-脱氮尿嘧啶-4-磷酸(3-deazaU-4-P)的四个新类似物,其中不稳定的磷酸酯氧被亚甲基和二氟亚甲基取代。U-4-P,化合物的亚甲基类似物1,制备由的钠盐的反应叔-带有保护的4- O-活化的尿苷的二乙基膦酰基乙酸丁酯,然后乙酸酯脱保护和脱羧。发现该化合物大概通过偏磷酸酯中间体进行相对容易的脱膦酰基化。二氟亚甲基衍生物化合物2通过受保护1的亲电氟化反应制得。该化合物是稳定的,并且没有进行去膦酰基化。3-deazaU-4-P,化合物3的亚甲基类似物的合成通过对被保护的4