アルケンの銅触媒によるアミノトリフローロメチル化
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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,銅触媒を用いたアルケンのアミノトリフローロメチル化のための新しい方法が導入されています. この反応は,新しい合成経路を提供して,高い地域選択性を持つ望ましい製品を生成します.
科学分野
- 有機化学
- 合成化学
- カタリシス
背景
- アミノトリフルオロメチル化は有機合成における重要な変換である.
- 既存の方法は,しばしば範囲,地域選択性,または反応条件の制限に直面します.
研究 の 目的
- アルケンのアミノトリフルオロメチル化のための前例のないプロトコルの開発.
- 容易に入手可能な試薬と穏やかな条件を用いて,高収量と地域選択性を達成する.
主な方法
- 銅 ((II) トリフラート (Cu ((OTf) 2) を触媒として使用する.
- トリフローロメチル源として (bpy) Zn ((CF3) 2) と窒素源としてN-fluorobis ((benzenesulfonyl) imide (NFSI) を使用する.
- 室温で様々なアルケーンと反応する.
主要な成果
- このプロトコルは,アミノトリフローロメチル化製品に満足のいく収量を提供することに成功しました.
- 高度の地域選択性が観察され,特にCF3根付加反応で典型的に見られるものとは対照的であった.
- この方法は,広範囲の基板と優れた機能群互換性を示した.
結論
- アルケンのアミノトリフルオロメチル化のための新しい効率的な方法が確立されています.
- 提案されたメカニズムは,アルキルラジカルトリフローロメチル化に続く最初のN-ラジカル添加を含みます.
- この研究は,複雑な有機フッ素化合物にアクセスするための貴重な新しいツールを提供します.
関連する概念動画
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
Strong acids, such as sulfuric acid, dissociate completely in an aqueous solution, and the acid participating in the reaction is the hydronium ion.
The first step is the slow protonation of an alkene at the less-substituted end to form...
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
The acid-catalyzed dehydration of...
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
Alkenes undergo polymerization via a free-radical mechanism involving three steps: initiation, propagation, and termination.
Radicals are...
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
The observed regioselectivity can be explained based on the radical stability and steric effect. From the radical stability perspective, adding hydrogen bromide in the presence of peroxide directs the bromine radical at the less substituted carbon via a more stable tertiary radical intermediate. Similarly, in the steric framework, the...
The anti-Markovnikov addition of hydrogen halides to an alkene is thermodynamically feasible only with HBr. The radical addition reaction with other hydrogen halides like HCl and HI is thermodynamically unfavorable.
Thermodynamic factors
The temperature influences the spontaneity of a reaction, which can be evaluated based on the change in the Gibbs free energy, ΔG. If the change in Gibbs free energy, ΔG, is negative, the reaction occurs spontaneously. As shown below, ΔG can be evaluated...
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...