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TEMPO-Me:電気化学的に活性化されたメチル化剤

Philip L Norcott1, Chelsey L Hammill1, Benjamin B Noble1

  • 1ARC Centre of Excellence for Electromaterials Science & Research School of Chemistry , Australian National University , Canberra , Australian Capital Territory 2601 , Australia.

Journal of the American Chemical Society
|September 5, 2019
PubMed
まとめ

1-メトキシ-2,2,6,6-テトラメチルピペリジン (TEMPO-Me) の電気化学的酸化により,強力なメチル化剤が生成されます. この現場で生成された反応剤は,SN2メカニズムを通じて芳香酸の効率的なメチル化を可能にします.

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科学分野:

  • 有機化学
  • 電気化学
  • 合成方法論

背景:

  • 1-メトキシ-2,2,6,6-テトラメチルピペリジン (TEMPO-Me) は,電気化学的刺激なしに環境条件下では安定しているが,反応しない.
  • 電子性メチル化は有機合成における重要な変換であり,しばしば強いまたは危険な反応剤を必要とします.
  • 温和で効率的なメチル化プロトコルの開発は,合成化学における継続的な課題です.

研究 の 目的:

  • TEMPO-Meの電気化学的酸化を調査する
  • メチル化剤として電気化学的に生成されたTEMPO-Meの有用性を実証する.
  • このシステムを用いて芳香酸のメチル化のためのプロトコルを開発する.

主な方法:

  • TEMPO-Meの電子化学的酸化
  • 反応メカニズムを明らかにするための計算研究 (例えば,DFT).
  • アロマティック酸のメチル化実験の検証
  • トリメチロキソニウムカチオンなどの既知の反応剤とのメチル化強度の比較

主要な成果:

  • TEMPO- Meの電気化学的酸化により,強力な電離性メチル化種が in situ 生成されます.
  • メチル化は,計算データと実験データによって裏付けられるSN2メカニズムによって行われます.
  • 生成された種のメチル化強度はトリメチロキソニウムカチオンに匹敵する.
  • TEMPO-Meを用いた芳香酸の電気化学メチル化のための新しいプロトコルが開発されました.

結論:

  • TEMPO-Meは電気化学的に活性化され,強力なメチル化剤を形成します.
  • この方法は,電化メチル化のための新しい,潜在的に穏やかな経路を提供します.
  • 開発されたプロトコルは,メチル化された芳香酸の合成のための貴重なツールを提供します.