Three-center intramolecular hydrogen bonding in oxamide derivatives. NMR and X-ray diffraction study
作者:F. J. Martínez-Martínez、I. I. Padilla-Martínez、M. A. Brito、E. D. Geniz、R. C. Rojas、J. B. R. Saavedra、H. Höpfl、M. Tlahuextl、R. Contreras
DOI:10.1039/a704640e
日期:——
describes the synthesis and structural investigation of the symmetric and non-symmetric oxamides N,N′-bis(2-hydroxyphenyl)oxamide 1, N,N′-bis(5-tert-butyl-2-hydroxyphenyl)oxamide 2, N,N′-bis(3,5-dimethyl-2-hydroxyphenyl)oxamide 3, N,N′-bis(2-hydroxybenzyl)oxamide 4, N,N′-diphenethyloxamide 5, N-(2-hydroxyphenyl)-N′-(2-methoxyphenyl)oxamide 6, N-(2-hydroxyphenyl)-N′-phenethyloxamide 7, (1S,2R)-(–)-N-(2-h
该贡献描述了对称和非对称的草酰胺N,N'-双(2-羟苯基)草酰胺1,N,N'-双(5-叔丁基-2-羟苯基)草酰胺2的合成和结构研究。N,N'-双(3,5-二甲基-2-羟基苯基)乙酰胺3,N,N'-双(2-羟基苄基)乙酰胺4,N,N'-二苯乙基乙酰胺5,N-(2-羟基苯基)- N '-(2-甲氧基苯基)草酰胺6,N-(2-羟基苯基)-N'-苯乙基草酰胺7,(1 S,2 R)-(-)- N-(2-羟基苯基氨基甲酰基羰基)去氧麻黄碱8,(1 R,2 S)-(-)- N-(2-羟基苯基氨基甲酰基羰基)9,乙基N-(2-羟基苯基)草酸酯10和乙基N -(2-甲氧基苯基)草酸酯11.通过1 H,13 C,15 N和可变温度NMR光谱确定结构。化合物1-4和6-11通过酰胺质子和两个氧原子之间的分子内三中心氢键而稳定。的1 1 H NMRΔ δ /Δ Ť酰胺质子相关因素的具有值15N NMR化学位移。1