史无前例的本佐基诺因基因图案揭示了proanthocyanidins的寡合化后修饰
Shu-Xi Jing, Daneel Ferreira, Pankaj Pandey
1Department of General Dental Sciences, School of Dentistry, Marquette University, Milwaukee, Wisconsin 53233, United States.
The Journal of organic chemistry
|September 25, 2023
概括
研究人员在肉中发现了新型的基诺诺伊德益氨酸 (PAC),进步了我们对天然产品生物合成及其作为牙科生物材料的潜力的理解.
科学领域:
- 自然产品化学 自然产品化学
- 生物材料科学 生物材料科学
- 有机化学 有机化学
背景情况:
- 氨酸胺 (PAC) 是复杂的flavan-3-ol聚合物,具有显著的化学复杂性.
- 作为牙科修复生物材料,PACs显示出前景.
- 对PAC的结构性表征,特别是绝对配置,带来了挑战.
研究的目的:
- 从肉中识别和表征新的生物活性氨酸.
- 开发一种新的综合分析方法来阐明PAC的结构.
- 研究PACs的生物合成途径,特别是后寡合化修饰的作用.
主要方法:
- 综合光谱学,包括量子力学驱动的1H代功能化旋转分析 (HifSA) 的NMR.
- 用于立体化学分析的实验和计算电子循环二元化 (ECD).
- 模型化合物的合成,包括4-(2,5-金) 黄-3-和三元体的截断模拟物 2.
主要成果:
- 发现了具有前所未有的o-和p-基因因基因的新型三基和四基PAC (基诺酸PAC).
- 使用综合合成分析方法阐明绝对配置.
- 在PAC生物合成中识别了两个不同的氧化后寡合化修饰 (POMs).
结论:
- 这项研究报告了第一个天然的基诺酸PACs,扩大了这种化合物类的已知的结构多样性.
- 这些发现为实验上难以捉摸的PAC生物合成提供了新的见解,强调了POMs的重要性.
- 发现的PAC为开发新型牙科生物材料提供了潜力.
相关概念视频
01:17Oxidation of Phenols to Quinones
3.1K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.1K
01:10Radical Chain-Growth Polymerization: Overview
2.5K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.5K
01:57Preparation of Diols and Pinacol Rearrangement
3.4K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
3.4K
01:20Radical Autoxidation
2.2K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.2K
00:59Reactions at the Benzylic Position: Oxidation and Reduction
3.7K
The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
3.7K
01:10Hydrolysis of Chlorobenzene to Phenol: Dow Process
2.9K
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
2.9K