Unexpected Resistance to Base-Catalyzed Hydrolysis of Nitrogen Pyramidal Amides Based on the 7-Azabicyclic[2.2.1]heptane Scaffold
作者:Diego Ocampo Gutiérrez de Velasco、Aoze Su、Luhan Zhai、Satowa Kinoshita、Yuko Otani、Tomohiko Ohwada
DOI:10.3390/molecules23092363
日期:——
of the base-catalyzed hydrolysis of 7-azabicyclo[2.2.1]heptane amides, which show pyramidalization of the amide nitrogen atom, and we compare the kinetics of the base-catalyzed hydrolysis of the benzamides of 7-azabicyclo[2.2.1]heptane and related monocyclic compounds. Unexpectedly, non-planar amides based on the 7-azabicyclo[2.2.1]heptane scaffold were found to be resistant to base-catalyzed hydrolysis
非平面酰胺通常是过渡结构,参与酰胺键的旋转和氮原子的转化,但是已经报道了一些最低限度的非平面酰胺。非平面酰胺通常对水或其他亲核试剂敏感,因此酰胺键容易断裂。在本文中,我们研究了7-氮杂双环[2.2.1]庚烷酰胺的碱催化水解反应的反应性,该反应表明酰胺氮原子呈锥体反应,并且比较了碱催化苯甲酰胺水解的动力学。 7-氮杂双环[2.2.1]庚烷和相关的单环化合物。出乎意料的是,发现基于7-氮杂双环[2.2.1]庚烷骨架的非平面酰胺对碱催化的水解具有抵抗力。计算的吉布斯自由能与该实验结果一致。热校正的贡献(熵项,⁻TΔS‡)很大;熵项(ΔS‡)取大的负值,表明过渡结构中的重要顺序包括溶剂化水分子。