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チェーンウォーキングによるディエネとディボロンによるリモートジボリレーティブサイクル
Shota Kanno1, Fumitoshi Kakiuchi1, Takuya Kochi1
1Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
Journal of the American Chemical Society
|October 25, 2021
まとめ
研究者は,チェーンウォーキングを使用してアルケンのリモートバイメタレーションのための新しい触媒方法を開発しました. このプロセスは,2つのボリル基を持つサイクロペンタン誘導体を効率的に生成し,複雑なC−H結合の機能化を可能にします.
科学分野:
- 有機金属化学
- キャタリシス
- 有機合成
背景:
- アルケンの触媒による遠隔バイメタライゼーションは難しい.
- 既存の方法は,複数の遠隔結合の連続的な構築に苦労しています.
- 活性化されていない sp3 C-H 結合の機能化は重要な合成目標である.
研究 の 目的:
- アルケンの基質の触媒による遠隔バイメタライゼーションのための新しい方法を開発する.
- 活性化されていない sp3 C-H ボンドをC-B ボンドに地域選択的に変換する.
- オーガニック分子に3つの遠隔結合の 連続的な構築を可能にします
主な方法:
- パラジウム触媒を用いた
- アルケンの基板を持つ二金属反応剤のチェーンウォーキングを使用しています.
- ディボロンと1,n-ダイエンの反応を研究した.
主要な成果:
- アルケーン基板の触媒による遠隔バイメタライゼーションが成功しました.
- 遠隔位置に2つのボリル基を有する合成サイクロペンタン派生体.
- 1,n-ダイエン (n ≥ 7) の3つの遠隔結合の連続構造が実証された.
結論:
- この新しいチェーン・ウォーキング・メソッドは,複雑なボリル化サイクロペンタンに効率的なアクセスを提供します.
- このアプローチは,地域選択的なC-H機能化のための強力な戦略を提供します.
- 開発された方法論は,複数の遠隔ボンドを構築する際の制限を克服します.
関連する概念動画
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01:16[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
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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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01:29Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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01:28Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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01:29Diels–Alder Reaction: Characteristics of Dienes
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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
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01:24Diels–Alder Reaction: Characteristics of Dienophiles
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In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends...
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends...
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01:16Cycloaddition Reactions: Overview
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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.
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