α-三次アミンのエナチオ固有合成:水性アンモニアによるルテニウム触媒型アリルアミネーション
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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。この研究は,アンモニアを用いた最初のルテニウム触媒によるアリル置換を導入する. この新しい触媒システムは,水溶液中のアリル炭酸からエナチオ濃縮されたプライマリアミンを効率的に生成します.
科学分野
- 有機化学
- カタリシス
- 合成化学
背景
- アンモニアは有機合成のための費用対効果の高い窒素源です.
- アモニアを水溶液で扱うことは便利で安全です.
- 水性アンモニアの直接使用は,過渡金属の触媒に挑戦しています.
研究 の 目的
- アモニアを用いた最初のルテニウム触媒型アリル置換反応の開発.
- 触媒アミネーション反応で水性アンモニアの直接使用を可能にします.
主な方法
- [Cp*Ru(MeCN) 3PF6とフェノキシチアゾリンリガンドを含む触媒系を使用した.
- 基板として使用された三次性アリルカルボネート.
- 反応は水中で行われた.
主要な成果
- 三次アリル炭酸塩のエナントオスペシフィックアミネーションを達成した.
- エナチオンの濃度が高い原始アミンを生産した.
- アミナ化製品の単一のレギオイソマーを得ている.
結論
- アモニアによるルテニウム触媒によるアルリック置換を成功裏に実証した.
- 開発された触媒システムは,水性媒体でエナチオ濃縮された原始アミンを合成するのに有効です.
関連する概念動画
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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...
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...
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...
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...