胺-α-环极衍生物及其因胺结合的二次体的合成和识别特性
Tomoya Endo1, Takashi Nakamura2
1Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan.
The Journal of organic chemistry
|August 1, 2025
概括
研究人员使用修改后的环氧德克斯特林制造了二度离子受体. 这些受体可以结合两个离子,与单个受体相比显示出改变的选择性,在人造离子通道中具有潜在的用途.
科学领域:
- 超分子化学 超分子化学
- 主机和客人的化学反应
- 分子识别分子识别
背景情况:
- 在超分子化学中,为特定的客结合设计分子受体至关重要.
- 控制有约束力的状态和构建独特的复合体是关键的挑战.
- 环极素是开发新型宿主分子的多功能支架.
研究的目的:
- 开发具有增强阴离子识别能力的 imine-bonded 二维阴离子受体.
- 为了研究这些二维受体的结构和结合特性.
- 探索作为人工离子通道或蛋白质模拟受体的潜在应用.
主要方法:
- 合成每一个{5-N-碳胺-5-脱氧甲基) -α-环氧素衍生物 (胺-α-CDs).
- 调节阳离子识别,通过改变芳胺基上的副替代物.
- 使用二胺来形成胺基-α-CDs的二元化,以形成胺基结合结构.
- 进行X射线衍射分析以确认二维结构.
- 具有约束力的研究来评估阳离子选择性 (乙酸盐,酸盐,酸盐与化物).
主要成果:
- 通过可调节的离子识别成功合成了胺-α-CD.
- 通过X射线衍射证实了精确定义的管状二维结构的形成.
- 证明二次受体可以封装两个离子 (乙酸盐,酸盐,酸盐).
- 观察到阴离子选择性的变化,化物与二元体不相互作用,与单元体不同.
结论:
- 胺基结合的二极体离子受体表现出独特的结合特性和选择性.
- 二维结构促进了多个阴离子的识别.
- 这些受体显示出模仿生物离子通道和多位点结合蛋白的应用的前景.
相关概念视频
01:29Preparation of Amides
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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
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01:16Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview
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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
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01:28Structures of Carboxylic Acid Derivatives
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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
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01:19Structure of Amines
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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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01:29Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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01:23Aldehydes and Ketones with Amines: Imine Formation Mechanism
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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
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