関連する実験動画
Updated: Jul 8, 2026

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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library
Published on: June 20, 2014
塩素-アル複合体によって触媒化されたアルファ,ベータ不飽和イミドへのエナチオセレクティブ・マイケル添加物
Mark S Taylor1, Eric N Jacobsen
1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.
Journal of the American Chemical Society
|October 14, 2005
まとめ
新しい (サレン) アルミニウム複合体は,結合添加反応を効率的に触媒化し,貴重な多機能化合物を生み出します. この方法は, (-) - パロキセチンへの経路を含む,エナチオメリックに濃縮されたピペリジンの非対称合成を可能にします.
科学分野:
- 有機化学 オーガニック・ケミストリー
- カタリシス カタリシス カタリシス
- アシンメトリック・シンセシス
背景:
- 結合添加反応は,C−C結合形成に不可欠である.
- 合成された多機能化合物へのアクセスは,依然として合成的な課題です.
研究 の 目的:
- ニトリルの結合添加のための効率的な触媒システムを開発する.
- 新規のエナンチオ濃縮された多機能化合物を合成する.
- 医薬品の中間製剤における合成応用を実証する.
主な方法:
- 触媒として (サレン) アルミニウム複合体を利用した.
- アルファ,ベータ不飽和イミドに二,三置換ニトリルの結合添加を行った.
- パイペリジンの非対称合成で製品を適用しました.
主要な成果:
- (サレン) アルミニウム複合体は,高い触媒効率を示した.
- 多種多様なアサイクルアルキルおよびアリル置換イミドが機能化され,成功しました.
- エナティオメリックに濃縮されたピペリジンが合成され, (-) - パロキセチンへの経路も含まれていた.
結論:
- ニトリルの非対称的結合添加のための新しい方法論が確立されました.
- このアプローチにより,これまで入手不可能だったエンアンチオイン濃縮多機能化合物へのアクセスを可能にします.
- この方法論は,価値ある医薬品の構成要素の合成に適用できます.
関連する概念動画
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
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...
Conjugate Addition to α,β-Unsaturated Carbonyl Compounds
α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
Amines to Alkenes: Hofmann Elimination
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...
Acid-Catalyzed Aldol Addition Reaction
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.
Aldol Condensation with β-Diesters: Knoevenagel Condensation
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis
Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.

