We show that dipyridylamine-acetamide (Dpaa), can be cleaved under mild acidic conditions (30% formic acid in dichloromethane). The release of the amine function is orthogonal to other acid-labile protecting groups. Calculations suggest that the ease of Dpaa cleavage relies on activation of the carbonyl function by the protonated dipyridylamine nitrogen and activation of a water molecule by a hydrogen-bond
我们表明二
吡啶胺-乙
酰胺 (Dpaa) 可以在温和的酸性条件下(含 30%
甲酸的
二氯甲烷)裂解。胺官能团的释放与其他酸不稳定保护基团正交。计算表明,Dpaa 裂解的难易程度依赖于质子化二
吡啶胺
氮对羰基官能团的激活和
氢键网络对
水分子的激活。