活性化されていない二次ハリドの光誘導,銅誘導のN-アルキル化反応を介して,カルバマートで保護された一次アミンの直接合成を可能にするフォトレドックス触媒の設計
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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。研究者は効率的なC−N結合形成のための新しい銅光還元触媒を開発した. この新しい方法は,カルバメットを非活性化された二次アルキル電ophilesと結合させ,有機合成の以前の制限を克服します.
科学分野
- 有機化学
- カタリシス
- 写真化学
背景
- 伝統的なS<sub>N</sub>2反応は,窒素核フィールとアルキル電極フィールを含むが,多くの置換は困難である.
- これらの反応の範囲を広げるには 効果的な移行金属触媒の開発が不可欠です
- 炭酸塩製品は有価な合成中間物質であり,固有の生物活性を持っています.
研究 の 目的
- 活性化されていない二次アルキル電ophilesとカルバマートヌクレオフィルを結合するための触媒的方法を開発する.
- 従来の経路で入手が難しい新しい代用カルバメットを合成する.
- フォトレドックス触媒を用いたC-N結合形成の室温プロセスを確立する.
主な方法
- トリデント酸カルバゾリド/ビスフォスフィンリガンドを搭載した新しい銅基フォトレドックス触媒の設計と合成
- 青い光の照射 (青いLEDランプ) を使って触媒を活性化します.
- フォトレドックス触媒と銅介C-N結合形成を含む反応機構の調査.
主要な成果
- 室温で活性化されていない二次アルキルブロミドと様々な原発カルバメットを成功裏に結合する.
- C-N結合形成のための新しい銅光還元触媒システムの実証.
- ケージ外プロセスで動作する二重銅システムをサポートするメカニズム研究.
結論
- 開発された銅光レドックス触媒は,カルバメートと二次アルキル電ophilesの結合を効果的に媒介する.
- この方法は,軽度な条件下で代替カルバマートへの新しい効率的な経路を提供します.
- この発見は,C−N結合形成反応に挑戦する際に,光還元触媒の有用性を拡大する.
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...
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...
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...
Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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...
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...