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脯氨酸类N-酰胺衍生物的核磁共振研究 |
An Nuclear Magnetic Resonance Study of Proline N-Amide Derivative |
投稿时间:2020-04-13 修订日期:2020-05-27 |
DOI:10.16495/j.1006-3757.2020.02.004 |
中文关键词: 液体磁共振 归属 2D核磁共振 脯氨酸 异构化 |
英文关键词:liquid NMR assignment 2D NMR proline isomerization |
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中文摘要: |
脯氨酸类衍生物结构独特,鲜有报道利用核磁共振(nuclear magnetic resonance,NMR)技术对氨基酸的手性进行鉴别.利用多种NMR技术:1H NMR、1H-1H同核位移相关谱(1H-1H COSY)、1H-1H质子全相关谱(1H-1H TOCSY)、1H-1H核Overhauser效应谱(1H-1H NOESY)、13C NMR、无畸变的极化转移增强法(DEPT135°)、1H-13C检出1H的异核单量子相干(1H-13C HSQC)和1H-13C检出1H的异核多键相关(1H-13C HMBC),对脯氨酸类N-酰胺衍生物两种构象异构体的1H和13C NMR进行了全归属,确定了室温下在二甲基亚砜(DMSO)中L型和D型的顺反异构体以相同的比例同时存在. |
英文摘要: |
Proline derivatives have unique structures, and few reports have been published on the chiral identification of amino acids by nuclear magnetic resonance (NMR). The structures of two proline N-amide conformation isomers were analyzed in detail using 1H NMR, 1H-1H correlated spectroscopy(1H-1H COSY), 1H-1H total correlation spectroscopy(1H-1H TOCSY), 1H-1H nuclear overhauser effect spectroscopy(1H-1H NOESY), 13C NMR, distortionless enhancement by polarization transfer(DEPT135°), 1H-13C 1H detected heteronuclear single quantum coherence(1H-13C HSQC) and 1H-13C 1H detected heteronuclear multiple-bond correlation(1H-13C HMBC) techniques, and the positions of 1H and 13C NMR peaks of the derivatives were assigned. The co-existence of L- and D-type cis-trans isomers in dimethylsulfoxide (DMSO) at room temperature were determined. |
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