3-dipolar cycloaddition of nitrones with vinyliodouracil, or vinyl acetate followed by coupling with silylated iodouracil, a series of 5-alkynyl N,O-nucleosides were synthesized via a palladium-catalyzed (Sonogashira) coupling reaction. The cytotoxic activity of modified nucleosides against HEp-2 cell lines was determined in vitro. The 5-ethynyl N,O-nucleoside, the only compound in the series containing a terminal
从 5-
碘 N,O-核苷开始,通过硝酮与
乙烯基碘尿
嘧啶或
乙酸乙烯酯的 1,3-偶极环加成反应,然后与甲
硅烷基化
碘尿
嘧啶偶联制备,通过
钯合成了一系列 5-炔基 N,O-核苷-催化(Sonogashira)偶联反应。体外测定了修饰核苷对 HEp-2
细胞系的细胞毒活性。发现 5-
乙炔基 N,O-核苷是该系列中唯一含有末端
乙炔单元的化合物,是活性最强的化合物。