原始アミンとアミドを酸性条件下でカリウムアシルトリフローロボラートで化学選択的にアキュレーションする.
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PubMedで要約を見る
まとめ
この要約は機械生成です。この研究では,水中のアシルトリフローロボラートと塩素剤を用いたアミド結合形成の新しい方法が導入されています. この緑色化学のアプローチは,効率的な合成のために有害な反応剤と有機溶媒を避けます.
科学分野
- 有機化学
- 緑の化学
- 合成方法論
背景
- 伝統的なアミド結合形成は脱水結合に依存しています.
- これらの方法はしばしば厳しい条件,有機溶媒,危険な反応剤を必要とします.
- 機能群の許容度と範囲は,現在の方法ではしばしば制限されています.
研究 の 目的
- アミド結合形成のための新しい,効率的で環境に優しい方法を開発する.
- アミド合成の範囲を,挑戦的な基板を含むように拡張する.
- 有機合成の遅い段階の機能化のための汎用的なツールを提供する.
主な方法
- カリウムアシルトリフローロボラートをアシレート剤として使用した.
- 促進剤として単純な塩素化剤を使用した.
- 反応は水中,しばしば酸性環境で行われます.
主要な成果
- 軽い水分条件下での素早いアミド結合形成を達成した.
- アルコールと二次アミンを含む様々な機能群を許容する,広範な基板の範囲を示した.
- 主要なアミドやスルフォナミドなどの N-H 含有グループに挑戦して機能化しました.
結論
- 開発された方法は,従来のアミド合成に持続可能で効率的な代替手段を提供します.
- このアプローチは,特に複雑な分子に対して,アミド結合構造の適用性を拡大する.
- この反応の強さは,薬剤発見と材料科学における後期機能化に適しています.
関連する概念動画
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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...
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
Reductive amination using sodium cyanoborohydride as the reducing agent is called the Borch reaction. Sodium cyanoborohydride is a mild...
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
The reaction takes place in two steps:
1. The first step is the deprotonation of the terminal alkyne by the strong base forming an acetylide ion.
2. The second step is a nucleophilic...