オレフィンアジリジネーションを触媒的に行うためのユニークで非常に効率的な方法.
1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
Journal of the American Chemical Society
|November 15, 2002
まとめ
この研究は,硫酸塩酸エステルとロジウム触媒を用いたオレフィンアジリジナーションの新しい効率的な方法を提示しています. このプロセスは,1,2-アミンの誘導体と原始アミンを合成するための貴重なアジリジン中間産物を生成します.
科学分野:
- 有機化学 オーガニック・ケミストリー
- 合成化学 合成化学とは
背景:
- アジリジネーションは,有機合成における重要な変換である.
- アジリジネーションの効率的でステレオ特異的な方法の開発は,依然として活発な研究分野です.
研究 の 目的:
- オレフィンアジリジネーションのための簡単で,高収量で,ステレオ特異的な方法を開発する.
- 硫酸エステルをN原子移転反応に使用する.
主な方法:
- 窒素源として硫酸エステルを使用する.
- 1〜2モル%のRh2 ((tfacam) 4) を触媒として利用する.
- PhI(OAc) 2をN原子移転の末端酸化剤として使用する.
- 様々なアルケンがH2NSO3CH2CCl3.3.と反応する.
主要な成果:
- 容易で,高収量で,ステレオ特異的なオレフィンアジリジネーションを達成しました.
- 合成されたアルコキシスルフォニルアジリジンは,多用途の中間物質として.
- アジリジンから1,2-アミンの誘導体へのスムーズな核性環開きが実証されています.
- N-トリクロロエトキシスルフォニル基を除去し,軽度な還元条件を介してプライマリアミンを生成しました.
結論:
- 説明されている方法は,アジリジネーションのための効率的で便利なアプローチを提供します.
- その結果生成されるアジリジンの中間物質は,複雑なアミン構造を合成するのに価値があります.
- この化学は,有機合成のための有用な新しいツールを提供します.
関連する概念動画
02:50Catalysis
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
01:18Carboxylic Acids to Acid Chlorides
Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
01:12Acid Halides to Esters: Alcoholysis
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
01:15α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
01:27Catalysis
Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...