調節可能な軸性キラルイミダゾール基P,N-リガンドによって活性化される窒素への触媒的エナチオセレクティブアルキン添加
Shengkang Yin1, Kendall N Weeks1, Aaron Aponick1
1Florida Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.
Journal of the American Chemical Society
|March 6, 2024
まとめ
この研究では,初めて,ナイトロンに銅で触媒化されたエナンチオセレクティブアルキンを加えた. この新しい方法は,価値ある窒素を含む化合物であるキラルプロパルギルN-ヒドロキシラミンを効率的に合成します.
科学分野:
- 有機化学
- カタリシス
- アシンメトリック・シンセシス
背景:
- 触媒エナチオセレクティブアルキンの添加はキラル分子の合成に不可欠である.
- ニトロンへのアルキンの添加は,一般的なキラル触媒システムがないため,困難です.
研究 の 目的:
- ニートロンにCu触媒によるエナチオセレクティブアルキン添加物を開発する.
- キラルプロパルギルN-ヒドロキシラミンを合成するための一般的で効率的なプロトコルを確立する.
主な方法:
- 調節可能な軸性キラルイミダゾールベースのP,N-リガンドを銅触媒で利用した.
- 様々なニトロンとアルキンの反応範囲を調査した.
主要な成果:
- ニトロンへのCu触媒による第1のエナチオセレクティブアルキン添加を達成した.
- 反応性と選択性の課題を克服するシンプルで効果的なプロトコルを開発しました.
- クイラルプロパルギルN-ヒドロキシラミンの 合成に成功しました
結論:
- 開発されたプロトコルは,キラルプロパルギルN-ヒドロキシラミンへの簡素化された経路を提供します.
- これらの製品は,様々な光学的に活性な窒素を含む化合物の前駆体として機能する.
- この研究は,窒素ヘテロサイクルの非対称合成方法論を進めている.
さらに関連する動画
関連する概念動画
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
3.3K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
7.7K
01:10α-Alkylation of Ketones via Enolate Ions
3.1K
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
3.1K
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
3.4K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.4K
01:26Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction
3.4K
α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
3.4K
02:38Electrophilic Addition to Alkynes: Halogenation
8.2K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.2K