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相关概念视频

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview01:19

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

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The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
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Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

4.1K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
4.1K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

2.1K
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.
2.1K
Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization01:13

Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

3.2K
Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
3.2K
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

3.9K
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...
3.9K
Nitriles to Carboxylic Acids: Hydrolysis01:08

Nitriles to Carboxylic Acids: Hydrolysis

4.8K
Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.
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由N-hydroxynaphthalimide Ester启用的生物相容的脱碳酶化合.

Hongze Liao1, Zhiyou Su1, Jia Zhang1

  • 1Department of Pharmacy, Ren Ji Hospital, College of Clinical Pharmacy, State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Nature communications
|November 24, 2025
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概括

这项研究引入了一种新的无催化剂,光诱导的反应,使用N-hydroxynaphthalimide Ester进行有效的Csp3-Csp3合. 这种方法使生物系统,包括活细胞中的化学修饰成为可能.

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科学领域:

  • 有机化学 有机化学
  • 摄影化学的使用.
  • 化学生物学 化学生物学

背景情况:

  • 开发高效和多功能合反应对于有机合成和化学生物学至关重要.
  • 无催化剂和光诱导的方法为传统合成方法提供了可持续和温和的替代方案.
  • 在光化学转化过程中,N-氨酸纳胺 (NHNI) 具有作为多功能试剂的潜力.

研究的目的:

  • 开发一种使用NHNI Ester的无催化剂,光诱导的脱碳氧化合方法.
  • 探索这种方法对Csp3-Csp3键形成的范围和效率.
  • 证明这种方法在生物应用中的实用性,包括活细胞修饰.

主要方法:

  • 使用N-hydroxynaphthalimide Ester作为光敏化剂,氧化剂和氧化还原活性在光诱导的脱碳氧化合中.
  • 在细胞溶解物中研究Csp3-Csp3合反应与乙醇乙烯和迈克尔受体.
  • 采用光物理特性来理解捐赠-接受 (D-A) 框架在通过电荷转移 (CT) 提高反应效率方面的作用.
  • 将开发的方法应用于标签和DNA编码库 (DEL) 技术.
  • 在活细胞中使用共聚焦显微镜和高分辨率质谱 (HRMS) 验证应用.

主要成果:

  • 实现了高效的无催化剂,光诱导的Csp3-Csp3合反应.
  • 使用具有捐赠者-接受者 (D-A) 框架的基板证明了反应效率的提高,这归因于改善的电荷转移 (CT) 状态形成.
  • 成功应用了标签的方法,并在DNA编码库 (DEL) 中引入多种基.
  • 证实了该方法在活细胞中的成功应用,展示了其对生物修饰的潜力.

结论:

  • N-hydroxynaphthalimide Ester 作为有效的多功能试剂,用于无催化剂,光诱导的脱碳氧化合.
  • 通过促进电荷转移状态,D-A框架显著提高了合效率.
  • 该方法为生物系统 (包括活细胞) 中的化学修饰提供了一种多功能和高效的工具.