![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)
ステリニルアジリジンのニッケル触媒的エナンチオセレクティブ還元性交配
Brian P Woods1, Manuel Orlandi2, Chung-Yang Huang1
1Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States.
Journal of the American Chemical Society
|April 14, 2017
まとめ
この研究では,ステルニルアジリジンとアリルヨドドを結合したニッケル触媒反応が導入されます. この方法では,ラセミックな原料からエナンチオ濃縮された2アルフェネチアミンを効率的に生成します.
科学分野:
- 有機化学
- キャタリシス
- 非対称合成
背景:
- 還元性交配反応はC−C結合形成に不可欠である.
- キラルアミンを合成するための効率的な方法の開発は,有機化学における重要な課題です.
研究 の 目的:
- ニッケル触媒による 還元性交互結合反応を報告する
- スチレニルアジリジンとアリルイオジドから2アリルフェネチアミンを非対称的に合成する.
- 触媒系におけるエナチオ選択性に影響を与える要因を調査する.
主な方法:
- ニッケル触媒による還元クロスカップリング反応
- スチレニルアジリジンとアリルイオジドを基板として使用する.
- 非対称な触媒のためにキラルバイオカゾリンリガンドを使用する.
- ステレオコンバージェント反応機構分析
主要な成果:
- スチレニルアジリジンとアリルイオジドをニッケル触媒で成功裏に結合した.
- ラセミックアジリジンから2アリルフェネチアミンの形成で達成された高いエナンチオ選択性.
- ステレオコンバージェント反応経路の実証
- エナンチオセレクティビティの鍵となる要素として,リガンドの極化性を特定する.
結論:
- ステレオセレクティブで効率的な2アリルフェネチアミンの合成方法が開発された.
- この研究は,非対称なニッケル触媒におけるキラルバイオキサゾリンリガンドの可能性を強調している.
- エナチオ選択性を支配する要因を理解することで,将来の触媒システムを設計するための洞察が得られます.
関連する概念動画
02:43E1 Reaction: Stereochemistry and Regiochemistry
9.4K
One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
9.4K
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
14.4K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
14.4K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.2K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.2K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
2.7K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
2.7K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.0K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.0K
01:12Acid Halides to Esters: Alcoholysis
3.3K
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:
3.3K