α 置換エナミドのロジウム触媒による非対称的還元型水酸化
Yuxin Zhu1, Yuchen Zhang2, Dongyang He1
1State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China.
Journal of the American Chemical Society
|November 21, 2024
まとめ
新しいロジウム触媒反応は,エナミドからキラル1,3アミノアルコールを効率的に生成します. この方法は薬剤にとって不可欠な 酵素濃縮化合物を 単一のステップで生成します
科学分野:
- 有機化学
- カタリシス
- 薬剤化学
背景:
- チラルのアミノアルコールは,天然製品と医薬品の重要な構成要素です.
- 既存の合成経路は,エナティオメリで濃縮された γ-アミノアルコールの効率と原子経済性が欠けていることが多い.
研究 の 目的:
- キラル1,3-アミノアルコールを合成するための高度にエナチオセレクティブで原子経済的な方法を開発する.
- 簡単に入手可能なα-置換エナミドから単段階の変換を確立する.
主な方法:
- α 置換エナミドのロジウム触媒による還元性水酸化.
- 新しい4,4'-ビサリアミノ置換 BIBOP リガンド (TFPNH-BIBOP) の開発.
- 反応メカニズムを理解するために DFT 計算と実験データを活用する.
主要な成果:
- 薬学的に価値のある様々なキラル1,3-アミノアルコールの合成が成功し,良好な収穫量と優れたエナチオ選択性があります.
- TFPNH-BIBOPリガンドが高いエナチオ選択性を達成する上で重要な役割を演じている.
- 反応性と選択性の重要な要因として,水素結合の相互作用を特定した.
結論:
- 開発されたロジウム触媒による還元性水酸化は,キラル1,3-アミノアルコールの合成のための効率的でエナントオセレクティブな方法である.
- このアプローチは,マラビロックの重要な中間物質を含む,価値ある医薬品への簡潔な経路を提供します.
関連する概念動画
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
3.2K
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction
3.3K
α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
3.3K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.6K
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.
7.6K
Amines to Alkenes: Hofmann Elimination
2.5K
Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
2.5K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
3.6K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
3.6K
Radical Anti-Markovnikov Addition to Alkenes: Overview
3.3K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.3K


