イリジウム触媒のエナチオセレクティブC ((sp3) -Hアミデーション 誘導的非共性相互作用によって制御される
Hao Wang1, Yoonsu Park2,3, Ziqian Bai1
1State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China.
Journal of the American Chemical Society
|April 13, 2019
まとめ
新しいキラル触媒は,エナチオセレクティブのC ((sp3) -H機能化を可能にします. この研究は,C ((sp3) -Hアミデーション経由で光学的に濃縮されたγ-ラクトームを合成するためのイリジウム ((III)) 触媒反応を導入し,制御のために魅力的な非共性相互作用を使用する.
科学分野:
- 有機化学
- カタリシス
- 非対称合成
背景:
- エナチオセレクティブのC ((sp3) -H機能化は,キラル分子の合成に不可欠である.
- 非対称な金属触媒には,非共性相互作用を利用する新しいキラル触媒の開発が非常に望ましい.
- 既存の方法はしばしばステリック反射に依存し,より広範な適用性を制限する.
研究 の 目的:
- エナチオセレクティブのC ((sp3) -H機能化のための新しいキラル触媒を開発する.
- 新しいイリジウム ((III)) 触媒化された分子内C ((sp3) -Hアミデーション反応を確立する.
- 速度加速度とエナチオ制御のための魅力的な非共性相互作用を使用して,光学的に濃縮されたγ-ラクトームを合成する.
主な方法:
- イリジウム (III) 触媒のための新しいα-アミノ酸ベースのキラルリガンドの設計と合成.
- ダイオクサゾロン基質の分子内C ((sp3) -Hアミダーション反応の発生
- 水を共溶剤として使用することを含む反応条件の調査.
- エナチオコントロールメカニズムの解明のためのメカニズム研究.
主要な成果:
- Ir (III) -触媒化C (sp3) -Hアミデーションによる高エナント選択性γ-ラクトームの合成を達成した.
- 軽度な条件下で活性化および非活性化アルキルC ((sp3) -H結合の両方に優れた効率性とエナチオ選択性が実証されています.
- γ-アルキルγ-ラクタムの非対称合成のための最初の一般的な経路を確立した.
- コソルベンツとしての水は,γ- アリルラクタム合成のエナンチオセレクティブ性を有意に改善した.
- 機械学的研究は,キラルポケット内の魅力的な非共性相互作用に基づいたユニークなエナチオコントロールメカニズムを明らかにした.
結論:
- 新しく設計されたα-アミノ酸ベースのキラルリガンドとIr (III) 触媒は,高度にエナチオセレクティブのC (sp3) -Hアミダ化を可能にします.
- この方法は,光学的に濃縮されたγ-ラクタム,γ-アルキルおよびγ-アリル変種を含む一般的な効率的な経路を提供します.
- 触媒は前例のないメカニズムで 魅力的な非共性相互作用を利用し,非対称な金属触媒の範囲を拡大します
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