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流動マイクロリアクターを用いて,化学選択的クロスカップリング反応への切り替え可能なアプローチ

  • 0Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigakukatsura Nishikyo-ku, Kyoto 615-8510, Japan.

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まとめ

この要約は機械生成です。

合成するのは困難です 新しいフローマイクロリアクターの方法は,金属と触媒の選択に基づくクロスカップリング反応で選択的反応性を示し,それらの生成を可能にします.

科学分野

  • 有機金属化学
  • 合成方法論
  • 材料科学

背景

  • ディメタル酸アルネは 価値ある合成中間物質ですが 製造が非常に難しいと知られています
  • 既存の合成経路は限られており 化学的性質の探求を妨げています

研究 の 目的

  • ディメタラテッドアレンを合成するための新しく効率的な方法を開発する.
  • これらの新しい化合物の化学選択性を触媒的クロスカップリング反応で調査する.

主な方法

  • 集積フローマイクロリアクターのシステムを使用した.
  • トライキルボラート分子を有する生成および反応したアリルリチウム.
  • ボリルと様々な金属置換物 (ボリル,シリル,スタンニル,ジンキル) で合成されたアレン.

主要な成果

  • 流量マイクロリアクターを用いて ダイメタラテッドアーレンの 一連の合成に成功しました
  • パラジアム触媒による交互結合反応で 顕著な化学選択性を示した.
  • 金属代用剤とパラジウム触媒によって 調整可能な選択性を示した.

結論

  • 開発されたフローマイクロリアクターの方法は,以前はアクセス不可能なディメタラテッド・アレーンに効率的にアクセスできます.
  • 合成されたバイメタリックアレーンは,クロスカップリングで調節可能な化学選択性を提供し,合成の有用性を拡大します.

関連する概念動画

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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.

The feasibility of cycloaddition reactions under thermal and photochemical conditions can be predicted...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation 02:17

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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...

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry 01:28

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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.

For the electrons to flow seamlessly between the two π systems, specific stereochemical and conformational requirements must be met.
Stereochemical Orbital Symmetry
The frontier molecular orbitals that satisfy the symmetry requirements are the...

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction 01:16

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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.

From a molecular orbital perspective, the interacting lobes of the two π systems must be in phase to permit...