カチオンロジウム ((I) -dppf 複合体触媒オレフィンイソメリゼーション/プロパルギル クレイゼン再配列/カルボニル移行カスケード
Ken Tanaka1, Eri Okazaki, Yu Shibata
1Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. tanaka-k@cc.tuat.ac.jp
Journal of the American Chemical Society
|July 18, 2009
まとめ
ロジウム ((I) -dppf触媒は,アルリルプロパルギルエーテルを適度な温度でアルレン酸アルデヒドに効率的に変換します. さらに加熱すると,カルボニル移動が促進され,十分な量のダイナールが生成されます.
科学分野:
- 有機化学 オーガニック・ケミストリー
- カタリシス カタリシス カタリシス
- 有機金属化学 有機金属化学
背景:
- アリルプロパルギルエーサーは,多用途の有機化合物である.
- イソメリゼーションとカルボニル移行は,重要な有機変異である.
- ロジウム複合体は,有機合成における効果的な触媒である.
研究 の 目的:
- カチオンのロジウム ((I) -dppf複合体の触媒活性を調査する.
- アリルプロパルギルエーテルからアレン酸アルデヒドとダイナルの合成を調査する.
主な方法:
- カチオンのロジウム ((I) -dppf複合体を用いた触媒性イソメリゼーション.
- 温度変化による反応最適化.
- 標準的な分析技術を用いた製品の特徴付け.
主要な成果:
- ロジウム ((I) -dppf複合体は,アルリルプロパルギルエーサーのイソメリゼーションをアルレンアルデヒドに効率的に触媒化する.
- 室温から40°Cまでの温度で良い収穫が得られました.
- 80°Cでは,さらにカーボニル移動が起こり,良い収穫量でダイナルを産出しました.
結論:
- カチオンのロジウム ((I) -dppf複合体は,アレン酸アルデヒドとダイナルを合成する効果的な触媒である.
- 温度制御により,アレニンアルデヒドまたはデナルの選択的形成が可能です.
- この方法論は,複雑な不飽和カルボニル化合物を構築するための貴重な経路を提供します.
さらに関連する動画
関連する概念動画
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
Olefin Metathesis Polymerization: Overview
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization
Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
Preparation of Epoxides
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)

