<sup>1</sup>H NMR, <sup>13</sup>C NMR, and Computational DFT Studies of the Structure of 2-Acylcyclohexane-1,3-diones and Their Alkali Metal Salts in Solution
作者:Przemysław Szczeciński、Adam Gryff-Keller、Sergey Molchanov
DOI:10.1021/jo060583g
日期:2006.6.1
and lithium sodium and potassium salts of 1 have been measured. The compound 3, known as NTBC, is a life-saving medicine applied in tyrosinemia type I. The optimum molecular structures of the investigated objects in solutions have been found using the DFT method with B3LYP functional and 6-31G** and/or 6-311G(2d,p) basis set. The theoretical values of the NMR parameters of the investigated compounds
2-酰基取代的环己烷-1,3-二酮(酰基=甲酰基,1 ; 2-硝基苯甲酰基,2 ; 2-硝基-4-三氟甲基苯甲酰基,3)的1 H和13 C NMR光谱以及锂的钠盐和钾盐已测量1个。化合物3,称为NTBC,是一种用于I型酪氨酸血症的救生药物。使用具有B3LYP功能和6-31G **和/或6的DFT方法,发现了溶液中被研究对象的最佳分子结构。 -311G(2d,p)基本集。使用GIAO DFT B3LYP / 6-311G(2d,p)方法计算出所研究化合物的NMR参数的理论值。化合物1的理论数据− 3已利用不同互变异构体之间的平衡来解释其实验NMR光谱。已经发现,对于这些三酮,内消旋互变异构体占主导。1种盐的NMR谱图差异考虑到阳离子的大小和盐离解的程度可以合理化。似乎在DMSO溶液中,锂盐主要作为通过锂阳离子与两个氧原子的螯合而稳定的离子对而存在。据估计,该盐的甲酰基旋转的活化自由能为51.5