パラジアム-イミノフォスフィンによって触媒化されたエニンのスタニラティブサイクル添加
Yoshiaki Nakao1, Yasuhiro Hirata, Shinjiro Ishihara
1Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510 Japan. nakao@npc05.kuic-u.ac.jp
Journal of the American Chemical Society
|December 2, 2004
まとめ
新しいパラジウム触媒反応により,エニンから複雑なオルガノスタナンの合成が可能になる. この方法は,高度に置換された3アルケニルフェニルスタナンを効率的に生成し,天然製品合成に適用されます.
科学分野:
- 有機金属化学 有機金属化学
- オーガニック・シンセシス オーガニック・シンセシス
- カタリシス カタリシス カタリシス
背景:
- パラジウム触媒は,現代の有機合成の礎石である.
- 複雑なオルガノスタナンを構築するための効率的な方法の開発は,依然として活発な研究分野です.
- 結合エニンは,サイクロアディション反応の汎用的な構成要素である.
研究 の 目的:
- 結合エニンの新しいパラジウム触媒スタニラティブサイクロアディションを開発する.
- この反応の範囲を様々なエニンとダインで探求する.
- 自然製品合成におけるこの方法の有用性を実証する.
主な方法:
- パラジアム-イミノフォスフィン複合体を触媒として使用した.
- スタニル化剤としてヘクサブチルディスタノキサンを使用した.
- 研究されたスタニラティブサイクル添加およびクロスサイクル添加反応.
主要な成果:
- 高度に置換された3アルケニルフェニルスタナンの地域選択合成を達成した.
- 異なる不飽和系間のスタンニラティブクロス・サイクロアディション反応を成功裏に実行した.
- アルシオプテロシンNの簡潔な合成のための開発方法の適用を実証しました.
結論:
- パラジアムで触媒化されたスタニラティブ・サイクロアディションは,有価なオルガン・スタニナンのための効率的な経路を提供します.
- この方法論は,複雑な分子構造を構築するための強力なツールを提供します.
- アルキオプテロシンNへの反応の成功応用は,その合成の可能性を強調しています.
さらに関連する動画
関連する概念動画
Preparation of Alkynes: Alkylation Reaction
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Preparation of Alkynes: Dehydrohalogenation
Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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.
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction
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.
Cycloaddition Reactions: Overview
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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