可见光促进 [3+2]-循环添加用于合成环[b]染色碳酸衍生物
Ewelina Kowalska1, Mateusz Dyguda1, Angelika Artelska2
1Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, Łódź 90-924, Poland.
The Journal of organic chemistry
|December 1, 2023
概括
这项研究引入了一种新的可见光催化方法,用于合成环[b]碳酸衍生物. 该反应使用易于获得的起始材料和光电氧催化剂进行高效的制备.
科学领域:
- 有机化学 有机化学
- 光催化作用的光催化
- 合成方法论 合成方法论
背景情况:
- 环[b]染色碳酸衍生物是具有多种生物活性的重要异环化合物.
- 这些化合物的高效合成途径对于进一步的研究和开发至关重要.
研究的目的:
- 开发一种新,高效和可见光促进的方法,用于合成环[b]chromenocarbonitrile衍生物.
- 探索 [3+2] 循环添加反应在构建复杂的异环框架中的实用性.
主要方法:
- 替代3-色素和N-cyclopropyloamines之间的 [3+2]循环添加反应.
- 由Eosin Y.启动的可见光光催化.
- 优化反应条件,包括溶剂,催化剂负载和大气.
主要成果:
- 成功合成了各种环[b]染色碳酸衍生物.
- 在温和的反应条件下获得高产量.
- 证明催化剂的效率和可回收性.
结论:
- 开发的方法提供了一个简单而可持续的途径,以获得有价值的环[b]chromenocarbonitrile支架.
- 可见光光催化剂为传统合成方法提供了一个有吸引力的替代方案.
- 该策略适用于为潜在应用准备各种衍生品.
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
相关概念视频
01:16Cycloaddition Reactions: Overview
2.6K
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.
2.6K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
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.
2.1K
01:16Cycloaddition Reactions: MO Requirements for Thermal Activation
3.6K
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.
3.6K
![[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F12417.jpg&w=3840&q=75)
01:16[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
10.2K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.2K
01:27Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
2.2K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.2K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
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
1.8K