光诱导的螺旋环化用于合成螺旋环化合物
Yu-Jie Cao1, Min Gu1, Quan-Qing Zhao1
1Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening, College of Pharmacy, Jiangsu Ocean University, Lianyungang, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|December 29, 2025
概括
可见光光催化使螺旋环的高效合成成为可能,这是药品中关键的3D支架. 本综述涵盖了最近的催化方法,基质范围和构建这些复杂分子的机制.
科学领域:
- 有机化学 有机化学
- 光催化作用的光催化
- 药用化学 医学化学
背景情况:
- 螺旋环是许多天然产品和制药剂中发现的重要3D结构图案.
- 它们独特的结构和物理化学性质使它们成为药物发现的有吸引力的目标.
- 螺旋环化合物的合成在过去十年中引起了大量的研究兴趣.
研究的目的:
- 为最近在可见光诱导的螺旋循环反应方面的进展提供全面的概述.
- 突出关键的催化方法,基质范围和螺旋环合成中的机械洞察力.
- 确定光催化螺旋循环化领域当前的局限性和未来的研究机会.
主要方法:
- 对文献的审查,重点是可见光光催化剂用于螺旋循环.
- 催化系统的分析,包括光催化剂和反应条件.
- 检查各种基质范围和反应机制.
主要成果:
- 最先进的可见光中介螺旋循环化策略的详细概述.
- 插图示例展示了光催化方法的效率和多功能性.
- 讨论控制这些转变的机械路径.
结论:
- 可见光光催化剂为螺旋环合成提供了一种强大而可持续的方法.
- 在扩大基质范围和催化剂效率方面仍然存在挑战.
- 未来的研究应该集中在开发新的催化系统和探索新的合成应用.
相关概念视频
Cycloaddition Reactions: Overview
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Photochemical Electrocyclic Reactions: Stereochemistry
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Thermal Electrocyclic Reactions: Stereochemistry
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.5K
Pericyclic Reactions: Introduction
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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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