通过可见光诱导的能量转移合成多替代二氧化[2.1.1]
Yujie Liang1, Roman Kleinmans1, Constantin G Daniliuc1
1Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstraße 40, 48149 Münster, Germany.
Journal of the American Chemical Society
|October 27, 2022
概括
研究人员使用可见光催化合成复杂的双循环分子的新方法. 这种方法产生了有价值的多替代的2-oxabicyclo[2.1.1]hexanes,扩大了药物发现的新化学结构.
科学领域:
- 有机化学
- 医学化学
- 光催化
背景情况:
- 自行车支架在制药开发中至关重要.
- 复杂有机分子的高效合成是一个关键的挑战.
研究的目的:
- 开发一种新的单一操作策略来合成多替代的二氧化.
- 探索可见光诱导的三重能量转移催化在构建独特的分子架构的实用性.
主要方法:
- 使用可见光诱导的三重能量转移催化剂.
- 作为起始材料使用的甲酸和双环[1.1.0]布坦.
- 提出了一种涉及光环添加,C-H抽象和基迁移的反应机制.
主要成果:
- 在一个步骤中成功合成多种多替代的2-氧化[2.1.1]hexanes.
- 证明了各种 (异质) 基向C2位置的成功迁移.
- 用以进一步化学修饰的柄获得的产品.
结论:
- 开发的方法可以快速获取以前无法获得的双循环分子.
- 这种策略可以构建复杂的,富含sp3的化学空间,用于药物发现.
- 的功能使其易于下游衍生,加速新药候选物的合成.
相关概念视频
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
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.
2.2K
Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
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
1.9K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
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.
2.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.7K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.7K
Thermal Electrocyclic Reactions: Stereochemistry
2.1K
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.
2.1K
Cycloaddition Reactions: Overview
2.7K
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.
2.7K

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