铁素介导的马龙酸盐的电化学多环化
Antoine Lefevre1, Régis Guillot1, Cyrille Kouklovsky1
1Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay et CNRS, Bâtiment Henri Moisson, 17 Avenue des Sciences, 91400 Orsay, France.
Organic letters
|August 27, 2024
概括
研究人员开发了一种电化学方法,用于合成芳香型二氧化. 这种新的方法避免了强烈的氧化剂,并简化了净化,提供了有效的生物相关化合物.
科学领域:
- 有机化学 有机化学
- 电化学 电化学 电化学
- 自然产品的合成自然产品的合成
背景情况:
- 亚比二烯酸是生物相关的分子.
- 现有的合成方法通常需要强烈的氧化剂和复杂的净化.
研究的目的:
- 开发一种高效的电化学方法来合成芳香的阿比二甲.
- 为了实现podocarpic酸,lambertic酸和相关的γ-lactones的正式合成.
主要方法:
- 由铁介导的马洛酸盐的阳极氧化启动的电化学循环.
- 单个电子转移过程.
主要成果:
- 成功进入生物相关的芳香性阿比二烯酸的核心.
- 波多卡普酸和兰伯特酸以及γ-乳的形式合成.
- 避免过多的氧化剂,如Mn(OAc) 3和简化净化.
结论:
- 电化学自行车化提供了一个精简和更绿色的路线,复杂的diterpenoids.
- 这种方法为传统合成策略提供了有价值的替代方案.
相关概念视频
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
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.
2.3K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
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.
2.0K
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.4K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.4K
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
01:21Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
3.7K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
3.7K
01:11Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene
7.0K
The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
7.0K