在受四结合相互作用影响的prolyl carbamates中进行Pro稳定
Shreya Banerjee1, Shama Tumminakatti1, Sudip Ghosh1
1Department of Chemistry, Indian Institute of Science, Bangalore, Karnataka - 560012, India. eprabhak@iisc.ac.in.
Organic & biomolecular chemistry
|October 28, 2024
概括
甲基酸盐表现出特定的电荷转移相互作用,称为四结合相互作用 (TBIs),这稳定了它们的cisPro旋转分子. 这些相互作用随着碳酸盐醇替代和溶剂极性增加而加强.
科学领域:
- 有机化学 有机化学
- 计算化学计算化学
- 结构生物学 结构生物学
背景情况:
- 甲基甲基酸盐是和药品中的重要结构动图.
- 了解旋转器偏好对于预测分子构造和功能至关重要.
- 微妙的非共价相互作用可以显著影响构造稳定性.
研究的目的:
- 为了研究稳定cisPro旋转体在同类prolyl carbamates中的相互作用的性质.
- 为了阐明电荷转移四结合相互作用 (TBIs) 在构造偏好中的作用.
- 确定影响这些稳定相互作用的强度和患病率的因素.
主要方法:
- 核磁共振 (NMR) 光谱用于实验分析.
- 量子化学计算用于理论建模和相互作用分析.
- 碳酸盐酒精替代剂和溶剂极性的系统变化.
主要成果:
- 核磁共振和理论分析在cisPro旋转体中确定了特定的电荷转移四结合相互作用 (TBIs).
- 这些TBI涉及碳-碳 (n → π*) 和碳酸盐内部 (n → σ*) 的电荷转移.
- 在碳酸盐醇上,随着更多的Cβ组,TBI数量和cisPro稳定性增加.
- 溶剂极性增加增强了cisPro碳酸的相对稳定性.
结论:
- 电荷转移四结合相互作用是cisPro旋转体稳定性的关键决定因素.
- 分子结构 (Cβ替代) 和环境 (溶剂极性) 调节这些稳定相互作用.
- 这项研究提供了关于和小分子结构的构造控制的见解.
相关概念视频
02:43Peptide Bonds
73.3K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
73.3K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
02:29Conformations of Cycloalkanes
11.6K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
11.6K
01:22Protein Folding
117.5K
Overview
117.5K
02:10Carbocations
10.9K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
10.9K
02:11Conformations of Cyclohexane
12.2K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.2K