一般的化学选择性阻碍胺合被TCFH催化氧化物和短暂的阴性保护所启用
Qiuhan Li1, Sarah Napier1, Andrew N Singh2
1Process Research & Development, Merck & Co., Inc., Rahway, New Jersey 07065, USA. qiuhan.li@merck.com.
概括
这项研究引入了一种新的化学选择性方法,用于使用TCFH和Oxyma形成胺键. 该策略有效地结合了反应不良的氨基,即使存在竞争性核友.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
背景情况:
- 胺基键的形成对于合成药品和材料至关重要.
- 在有机合成中,与竞争中的核素,特别是与酒精或初级氨基一起反应不良的氨基,实现化学选择性仍然是一个挑战.
研究的目的:
- 开发一种通用和化学选择性策略,用于涉及弱核胺胺的胺键形成.
- 为了克服在胺合反应中与酒精和初级氨基酸等相竞争的活性核的挑战.
主要方法:
- 使用TCFH (1-[Bis(dimethylamino) methylene]-1H-1,2,3-triazole[4,5-b]pyridinium 3-oxide hexafluorophosphate) 和催化Oxyma (乙烯基酸) 的组合作为试剂系统.
- 使用缺电子的化物掩盖更有反应性的氨基群,使受阻氨基的选择性合成为可能.
主要成果:
- 在与核友性较差的氨基一起形成胺键时实现了高效率和选择性.
- 在有反应性初级酒精和氨基的存在下,证明了成功的合,这通常是竞争的核爱好者.
- 展示了 imine 掩盖策略在合阻碍氨基的有效性.
结论:
- 开发的TCFH/Oxyma系统为胺合成提供了一个强大而多功能的化学选择性策略.
- 这种方法为将具有挑战性的,核性较差的氨基酸纳入胺结构提供了一种实际的解决方案.
- 临时的胺基掩蔽方法扩大了有机合成中氨基合反应的范围.
更多相关视频
相关概念视频
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism
3.4K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
3.4K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
2.1K
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).
2.1K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview
3.2K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.2K
Cycloaddition Reactions: MO Requirements for Thermal Activation
3.5K
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.
3.5K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
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.
2.0K
Amines to Alkenes: Cope Elimination
2.0K
Cope elimination reaction involves the conversion of tertiary amines to alkene using hydrogen peroxide under thermal conditions, as depicted in figure 1.
2.0K
![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)

