易斯酸促进的选择性转化,用于合成1,3-化-2-脱氧糖化物
Bindu Tiwari1, Ram P Pandey1, Manish Kumar Sharma1
1Department of Medicinal Chemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India.
The Journal of organic chemistry
|December 5, 2025
概括
这项研究引入了一种新的合成,即利用易斯酸介导的多米诺反应,从糖醇中合成1,3-解-2-脱氧糖化物. 这种方法为创造有价值的生物活性分子提供了一个区域选择性途径.
科学领域:
- 有机化学 有机化学
- 药用化学 医学化学
- 碳水化合物化学 碳水化合物化学
背景情况:
- 脱氧糖化物是重要的生物活性分子,具有重要的医疗应用.
- 糖醇是碳水化合物合成中的多功能起始材料.
- 经典的糖基化方法在某些合成途径上存在局限性.
研究的目的:
- 开发一种新型的合成路径,用于1,3-无效-2-脱氧糖化物.
- 探索糖醇在废除反应中的实用性.
- 为了研究发达反应的区域选择性和基质范围.
主要方法:
- 路易斯酸介导的多米诺反应使用受保护的糖醇和外部核.
- 从乙化d-galactal,d-arabinal和l-fucal中合成1,3-取消的-2-脱氧糖化物.
- 探索各种芳香受体,包括纳夫,和纳.
- 涉及DFT计算和关键中间体的隔离的机制研究.
主要成果:
- 实现了高区域选择性合成1,3-解-2-脱氧糖化物.
- 特定的糖醇 (d-galactal,d-arabinal,l-fucal) 是有效的基质,而其他 (d-glucal,l-rhamnal,d-xylal) 的反应性有限.
- 反应表明了广泛的基质范围,包括多种受保护的甘氨酸和芳香受体.
- 机械学研究证实了氧化碳离子在C-3位置的优先攻击.
结论:
- 已经建立了一种新的高效的易斯酸介导多米诺反应,用于从糖质中合成1,3-无效-2-脱氧糖化物.
- 该反应表现出高的区域选择性,有利于形成1,3-结合产物.
- 了解反应机制为解消过程中糖的反应性提供了洞察力,扩大了药物化学中的合成可能性.
相关概念视频
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
4.0K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
4.0K
01:28Preparation of 1° Amines: Gabriel Synthesis
4.5K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
4.5K
01:15Acid-Catalyzed Aldol Addition Reaction
3.2K
The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.
3.2K
01:35Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives
2.5K
Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
2.5K
01:10α-Alkylation of Ketones via Enolate Ions
3.7K
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
3.7K
01:13Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents
5.9K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
5.9K