Ribose as the preferential target for the oxidized form of elliptinium acetate in ribonucleos(T)ides. Biological activities of the resulting adducts
作者:Genevieve Pratviel、Jean Bernadou、Tam Ha、Gerard Meunier、Suzy Cros、Bernard Meunier、B. Gillet、E. Guittet
DOI:10.1021/jm00158a005
日期:1986.8
always occurs on the 2'-oxygen of ribose (more slowly for pyrimidine than for purine); in a second step, cyclization of the reoxidized product leads to a spiro derivative: only one stereoisomer is detected with purine nucleoside; the other stereoisomer appears as a minor product (10-20%) with nucleotides and pyrimidine nucleosides. With modified bases, no change is observed except for bases exhibiting an
描述了氧化形式的抗肿瘤药物醋酸椭圆胺与各种核糖核苷酸(t)的共价结合。在碱基例如巯基上不存在强亲核试剂的情况下,该醌亚胺衍生物的主要靶标是糖部分。对于未修饰的规则碱基,第一次亲电子加成总是发生在核糖的2'-氧上(嘧啶比嘌呤更慢)。在第二步中,再氧化产物的环化产生螺环衍生物:嘌呤核苷仅检测到一种立体异构体;另一个立体异构体是次要产物(10-20%),带有核苷酸和嘧啶核苷。使用修饰的碱基,除了表现出额外的强亲核中心的碱基外,未观察到任何变化:被氧化的烷基椭圆烷基锡在硫原子上硫代鸟嘌呤和硫代鸟苷,在最后一种情况下不在核糖部分。所有的螺衍生物都比母体化合物具有更少的细胞毒性,即使该碱是抗代谢物(天青苷)也是如此。然而,硫代-椭圆形的加合物保持了很高的细胞毒性。