光诱导的兰催化:C-H激活和螺旋环化
Zhenhong Gan1, Xiaoyan Cai2, Liming Chen2
1Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry, Chemical Engineering, and Environment, Minnan Normal University, Zhangzhou 363000, China.
Organic letters
|December 9, 2025
概括
兰化物催化了一种使用分子氧气的C-H氧化和螺旋循环的新联体反应. 这种高效的方法精确地功能化复杂的分子,在环境条件下产生多样化的螺旋环化合物.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 有机合成 有机合成
背景情况:
- 开发用于复杂分子合成的高效方法至关重要.
- 螺旋环化合物是药品中重要的结构动图.
- C-H功能化为分子复杂性提供了一个强大的途径.
研究的目的:
- 报道了一种新的酸催化并联反应.
- 在环境条件下实现C(sp3) -H氧化和螺旋循环.
- 为了探索这种转变的机制.
主要方法:
- 兰催化协同反应. 催化协同反应.
- 使用分子氧气作为氧化剂.
- 在现场进行催化剂组装的多元组件协调.
- 涉及能量和电子转移通路的机制研究.
主要成果:
- 有效合成N,O-和O,O-螺旋环化合物.
- 广泛的功能组耐受性被证明.
- 实现了复杂的支架的精确功能化.
- 兰化物作为光敏剂和易斯酸催化剂.
结论:
- 建立了一个新的,环境条件的螺旋循环化方法.
- 反应通过协同能量和电子转移进行.
- 兰化物具有双重的催化作用,使得C-H裂变和循环.
相关概念视频
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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Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.6K
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.
2.6K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.9K
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.
2.9K
Thermal Electrocyclic Reactions: Stereochemistry
2.5K
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
Cycloaddition Reactions: MO Requirements for Thermal Activation
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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.1K
Cycloaddition Reactions: Overview
3.3K
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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