界面π-πスタッキング相互作用によるH₂駆動酵素的不斉還元
Wei Lan1, Jingru Yang1, Jiabao Wei1
1Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory of Advanced Catalysis and Adsorption Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China.
Angewandte Chemie (International ed. in English)
|January 16, 2026
まとめ
本研究では、H₂を用いた効率的なNADH再生のためのピッカリングエマルションマイクロリアクターを導入する。このシステムは高い選択性と2000サイクル超を達成し、持続可能な化学酵素的還元を進展させる。
科学分野:
- 生体触媒およびグリーンケミストリー
- 材料科学および工学
- 化学工学
背景:
- in situ 水素（H₂）駆動ニコチンアミドアデニンジヌクレオチド（リン酸）(NAD(P)H)再生は、持続可能な化学酵素的還元のために不可欠である。
- 課題としては、NAD(P)H生成における選択性の低さや、化学触媒と酵素間の相互失活が効率を妨げていることが挙げられる。
研究 の 目的:
- 高選択的かつ効率的なin situ NADH再生のための新規水中油型ピッカリングエマルションマイクロリアクターを開発すること。
- 開発したNADH再生システムを用いた不斉還元的分割のための化学酵素マイクロリアクターを構築すること。
主な方法:
- 方向性のあるH*移動のための界面π-πスタッキングを利用した水中油型ピッカリングエマルションマイクロリアクターを使用した。
- 不斉還元的分割のために、NADH再生システムとヘパリンアルコールデヒドロゲナーゼ（HLADH）を統合した。
- 化学酵素プロセスに還元剤としてH₂を使用した。
主要な成果:
- NADH再生において99%を超える選択率を達成した。
- キラルアルコール生成物である(S)-(-)-2-フェニル-1-プロパノールのエナンチオ選択性を99% ee以上示した。
- H₂駆動システムとしては記録的な2000サイクル以上のNADH再生を維持した。
結論:
- ピッカリングエマルションマイクロリアクターは触媒を効果的に分離し、失活を軽減し、NADH再生効率を向上させる。
- このアプローチは、キラル化学物質生産のための持続可能かつ効率的な化学酵素マイクロリアクターを開発するための有望な戦略を提供する。
![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
関連する概念動画
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.8K
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...
3.8K
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
2.6K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.6K
02:13Reduction of Alkenes: Catalytic Hydrogenation
13.9K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
13.9K
01:19Acid Halides to Alcohols: LiAlH4 Reduction
3.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.8K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
8.9K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
8.9K
02:23Alcohols from Carbonyl Compounds: Reduction
12.1K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
12.1K