Displacement of a hydroxyl group in pyrimidine nucleosides having a vicinal diol system by a fluorine atom was investigated by using diethylaminosulfur trifluoride (DAST). Though participation of the base moiety often thwarts the desired introduction of a fluorine atom, it was found that appropriate modification of the base and/or sugar moieties allowed the desired fluorodehydroxylation to occur, giving 5'-, 3'-β-, and 2'-α-fluorinated uracilnucleosides in good yields.
通过使用
二乙基三
氟化
硫(
DAST),研究了用
氟原子置换具有邻位二醇体系的
嘧啶核苷中的羟基的问题。虽然碱基的参与往往会阻碍
氟原子的引入,但研究发现,对碱基和/或糖基进行适当的修饰可以实现所需的
氟脱羟基反应,从而以良好的收率得到 5'-、3'-β 和 2'-α
氟化尿
嘧啶核苷。