铜催化三组分碳氨基酸对缺电子的烯酸进行了乳化
Hannah C Wendlandt1, Grace L Trammel2, Daniel G Kohler2
1Department of Chemistry, University of Texas at Austin, 100 East 24th Street, Austin, Texas 78712, United States.
The Journal of organic chemistry
|January 10, 2024
概括
这项研究引入了一种新的铜催化反应,从简单的前体中形成γ-iminolactones. 这种高效的合成为有价值的异环化合物提供了一条新的途径.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 异环化学 异环化学
背景情况:
- 在药物和材料化学中,开发复杂有机分子的高效合成方法至关重要.
- γ-iminolactones是具有潜在生物活动的重要的异环基架.
- 现有的合成γ-iminolactones的方法可能是漫长的或需要恶劣的条件.
研究的目的:
- 开发一种新,高效和多功能的三组分反应,用于合成γ-iminolactones.
- 探索新开发的催化系统的范围和局限性.
- 为了阐明反应机制.
主要方法:
- 一种由铜 (I) 催化的三组合合反应,涉及α-,缺电子和初级氨基.
- 反应条件的优化,包括催化剂负荷,溶剂和温度.
- 对所有三个合伙伴的基质范围的探索.
- 机械学研究,包括中间捕获和动力学分析.
主要成果:
- 通过三组分的碳胺氨酸化反应成功合成了γ-iminolactones.
- 在温和条件下,反应以单个步骤进行,使用Cu (I) 催化剂.
- 合成了19个γ-iminolactones的样本,产量高达69%.
- 机理学研究表明,一个原子转移激素添加 (ATRA) 途径的参与导致一种氧碳中间体.
结论:
- 已经开发出一种新且高效的铜催化三组分碳氨酸乳酸化.
- 这种方法提供了直接访问有价值的γ-iminolactone异环.
- 反应机制涉及ATRA,提供了对基于基的C-C和C-N键形成的见解.
相关概念视频
Alkylation 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
Aldol Condensation with β-Diesters: Knoevenagel Condensation
3.0K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
3.0K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
3.8K
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...
3.8K
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
2.9K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
2.9K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview
1.8K
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
1.8K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
18.0K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
18.0K


