関連する実験動画
Updated: Jun 24, 2026

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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library
Published on: June 20, 2014
アルファ-ヒドロキシ-ベータ-アミノ酸のステレオ制御された非対称合成. ステレオダイバージェントなアプローチ
Y Aoyagi1, R P Jain, R M Williams
1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
Journal of the American Chemical Society
|July 27, 2001
まとめ
この研究では,アルファ-ヒドロキシ-ベータ-アミノ酸を合成するためのステレオ制御方法について詳細に述べています. このプロセスは,ルイス酸促進シアネーションと塩基触媒化水解を使用して,価値あるキラル化合物を生成します.
科学分野:
- 有機化学 オーガニック・ケミストリー
- アシンメトリック・シンセシス
- ステレオ選択的反応
背景:
- アルファ-ヒドロキシ-ベータ-アミノ酸は,医薬品化学における重要なキラル構成要素である.
- これらの化合物にアクセスするには,効率的でステレオ選択的な合成経路の開発が不可欠です.
研究 の 目的:
- アルファ-ヒドロキシ-ベータ-アミノ酸のステレオ制御された非対称合成を調査する.
- ダイアステロエーマー的に純粋な中間物質を生産するための信頼性の高い方法を確立する.
主な方法:
- トリメチルシリルシアン酸を使用したオクサジン誘導体のルイス酸促進シアン化.
- その結果生じるシアノ化合物の塩基触媒化水解.
主要な成果:
- 水解のステップで優れたステレオ選択性を達成しました.
- ダイアステロエーマー的に純粋なオクサジン-2-カルボキシル酸を成功裏に合成しました.
- エナティオメリックに純粋なイソトレオニンとノール-C-スタチンへのアクセスを提供しました.
結論:
- 開発された方法は,立体化学的に定義されたアルファ-ヒドロキシ-ベータ-アミノ酸への効率的な経路を提供します.
- このアプローチは,イソトレオニンやノル-C-スタチンなどの重要な医薬品中間物質の合成を容易にする.
関連する概念動画
Preparation of Alcohols via Substitution Reactions
Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
Crossed Aldol Reaction Using Weak Bases
This lesson deals with the crossed aldol reaction using weak bases. The self-condensation of an aldehyde having α hydrogen is prevented by adding it slowly to a mixture of formaldehyde and weak bases like hydroxide and alkoxide. Upon slow addition of the aldehyde, the base deprotonates the α carbon of the aldehyde to form the corresponding enolate. The enolate subsequently attacks the formaldehyde to form a single crossed product. Figure 1 depicts the aforementioned reaction.
C–C Bond Cleavage: Retro-Aldol Reaction
The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
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.
Alkylation of β-Diester Enolates: Malonic Ester Synthesis
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.

