Application of the pivaloyl group as a protection for the N3 position of thymidine and uridine was investigated. Pivaloylation of thymidine is a very rapid reaction proceeding under mild conditions with excellent regioselectivity for sugar or thymine moiety, depending on the amines used. Several pivaloylated thymidine derivatives were obtained by treatment of unprotected thymidine with pivaloyl chloride under various experimental conditions. Stability of the N3-pivaloyl protecting group under basic and acidic conditions was evaluated and the conditions for its selective removal were found.
对
蒽酰基团作为胸腺
嘧啶和尿
嘧啶N3位置的保护的应用进行了研究。胸腺
嘧啶的
蒽酰化是一种非常快速的反应,在温和条件下进行,具有对糖或胸
嘧啶基团的优异区域选择性,取决于使用的
胺类。通过在不同实验条件下使用
蒽酰
氯处理未受保护的胸腺
嘧啶,得到了几种
蒽酰化胸腺
嘧啶衍
生物。评估了N3-
蒽酰保护基在酸性和碱性条件下的稳定性,并找到了其选择性去除的条件。