グリシンエステルの触媒的非対称活性化のためのキラルアルデヒド触媒
Wei Wen1, Lei Chen1, Ming-Jing Luo1
1Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering , Southwest University , Chongqing 400715 , China.
Journal of the American Chemical Society
|July 12, 2018
まとめ
この研究は,N-無保護アミノ酸の直接非対称的なα機能化のための新しいキラルアルデヒド触媒を導入する. この非ピリドクサル依存の効率的な触媒は,アミノ酸誘導体の新しい合成経路を可能にします.
科学分野:
- 有機化学
- 非対称な触媒
- アミノ酸化学
背景:
- チラルアルデヒド触媒は,イミン形成経由で,N-無保護アミノ酸の直接非対称的なα機能化に最適である.
- 以前の成功はアルドール反応と2アミノマロナートのアルキル化に限られていた.
研究 の 目的:
- 保護されていないアミノ酸の直接的な非対称的なα機能化のための新しいキラルアルデヒド触媒を開発する.
- 既存の触媒システムの限界を克服する.
主な方法:
- 新型キラルアルデヒド触媒の設計と合成
- 保護されていないN-グリシンエステルのα機能化における触媒活性を示す.
- 密度関数理論 (DFT) の計算を用いた反応機構の調査.
主要な成果:
- 新型キラルアルデヒド触媒は,N-保護されていないグリシンエステルの直接の非対称的なα機能化を効率的に促進する.
- この触媒は,ピリドクサルの依存性のないシステムで初めて,高いキラル誘導でこの変換を達成した.
- DFT計算は,移行状態と陽子転送プロセスに関する洞察を提供しました.
結論:
- 新種のキラルアルデヒド触媒が開発され,N-無保護アミノ酸の効率的な非対称性α機能化が可能である.
- この突破はキラルアミノ酸を 合成するための強力なツールです
- この発見は非対称な触媒とアミノ酸化学の分野を発展させました
関連する概念動画
02:50Catalysis
30.6K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.6K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.9K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.9K
02:25Chirality
29.6K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
29.6K
02:30Chirality in Nature
17.3K
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.
17.3K
01:11Rotation of Asymmetric Top
1.6K
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
1.6K
01:35Asymmetric Lipid Bilayer
9.9K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
9.9K