一个酶选择性脱碳氧化甘氨酸阿尔多尔反应
Md Ataur Rahman1, Mohammad Rehan1, Torsten Cellnik1
1Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, United Arab Emirates.
Organic letters
|October 10, 2024
概括
研究人员使用一种新型激活开发了一种新的酶选择性脱碳化糖醇醇反应. 这种高效的方法产生二氧化碳作为唯一的副产品,并允许合成有价值的多氧化化合物.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
背景情况:
- 马龙酸衍生物是多功能合成中间体.
- 阿尔多尔反应对于形成碳-碳键至关重要.
- 选择性合成对于产生性分子至关重要.
研究的目的:
- 开发一种新的,高度选性的脱碳糖基酸醇反应.
- 为了利用一个基基功能化马龙酸半 thioester 作为一个激活的体等价物.
- 为了证明复杂分子合成的新方法的合成实用性.
主要方法:
- 在阿尔多尔反应中使用基基功能化马龙酸半乙烯.
- 在环境温度,空气和水分耐受条件下进行反应.
- 使用该反应对α-基基-β-基酸 thioester 的 enantiodivergent 合成.
主要成果:
- 实现了高度反选择性的脱碳氧化糖醇醇反应.
- 反应在环境温度下进行得非常稳定,耐受空气和水分.
- 生产的二氧化碳 (CO2) 是唯一的副产品.
- 成功合成了具有高反选择性的α-基基-β-基黄糖酸二.
结论:
- 开发的方法提供了一种高效和多功能途径,以获得奇拉性α-基基-β-基酸 thioesters.
- 合成的乙烯作为各种多氧化基构建块,脱氧糖和天然产品,如 (-) - 血管 B. B. 的宝贵前体.
- 这项工作扩大了对酶选择性合成的工具包,特别是在 aldol 反应和功能化 thioesters 的背景下.
相关概念视频
01:08Base-Catalyzed Aldol Addition Reaction
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As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.
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01:15Acid-Catalyzed Aldol Addition Reaction
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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.
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00:56Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction
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The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.
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01:10C–C Bond Formation: Aldol Condensation Overview
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Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.
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00:57C–C Bond Cleavage: Retro-Aldol Reaction
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The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
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01:18Intramolecular Aldol Reaction
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Intramolecular aldol reaction occurs in dicarbonyl compounds such as dialdehydes, diketones, and keto-aldehydes. The dicarbonyl compounds possess more than one nucleophilic ⍺ carbon for the base to deprotonate and form the enolates. For example, in symmetrical diketones, there are four ⍺ carbons. Hence, four types of enolates are possible when treated with a base. However, since the molecule is symmetrical, the enolates formed on either side of one carbonyl group are equivalent to those...
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