在氨基酸和循环二中通过光化学脱血来产生明确的性
Johannes Großkopf1, Manuel Plaza1, Roger Jan Kutta2
1Department Chemie and Catalysis Research Center (CRC), School of Natural Sciences, Technische Universität München, D-85747, Garching, Germany.
Angewandte Chemie (International ed. in English)
|October 4, 2023
概括
现在可以使用一种性索芬催化剂来光化学地去除2,5-diketopiperazines的血糖. 这种方法允许在单个位置进行选择性的立体化学编辑,产生聚缩的循环二.
科学领域:
- 有机化学 有机化学
- 摄影化学的使用.
- 立体化学是一种立体化学.
背景情况:
- 2,5-Diketopiperazines是具有多种应用的循环二.
- 这些化合物的酶选择性合成对于它们的功能至关重要.
- 现有的从赛马体中制备2,5-diketopiperazines的酶选择性制备方法是有限的.
研究的目的:
- 开发一种新的方法,用于从种族物质中选择性制备2,5-diketopiperazines.
- 为了在狄基托皮佩拉津结构中的特定位置 (C6) 实现立体化学控制.
- 为了研究光化学脱血过程的机制.
主要方法:
- 通过光化学脱血,使用一种合式森催化剂.
- 在特定波长 (λ=366 nm) 的辐射.
- 暂时吸收光谱学用于研究反应中间体和机制.
主要成果:
- 在53个实例中,从赛马体中成功选择2,5-diketopiperazines.
- 取得的产量从74%到定量,与反体过剩 (ee) 从71%到99%.
- 在C6位置展示了选择性的立体化学编辑,而不会影响其他立体中心.
- 证实了催化剂通过长寿命的质子化基通过可逆转移原子的能力.
结论:
- 光化学脱血提供了一种强有力的策略,可以获取基丰富的2,5-二基皮.
- 该方法允许精确的立体化学控制和随后的功能化.
- 涉及长寿命基中间体的独特机制为光化学反应提供了新的见解.
相关概念视频
02:30Chirality in Nature
13.5K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
13.5K
02:05Prochirality
3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
01:28Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
3.9K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
3.9K
02:30Racemic Mixtures and the Resolution of Enantiomers
18.5K
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
18.5K
01:12Stereochemical Effects of Enolization
2.0K
The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.
2.0K
01:19Amines to Amides: Acylation of Amines
2.5K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
2.5K