クラシックとオゾノリティック・ラクトニゼーションの異なる運動制御:メカニズムに基づくダイアステロセレクション
1Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA. hoye@chem.umn.edu
Journal of the American Chemical Society
|June 9, 2005
まとめ
研究者らは,異なる乳酸化反応を用いて,ダイアステロエーマー型デルタ・ラクトンを生成するための新しい戦略を開発した. この方法はステレオ化学を制御し, (+) -ペロルシドAの断片を合成するために重要な特定の同位体を生成します.
科学分野:
- 有機化学 オーガニック・ケミストリー
- 合成化学 合成化学とは
背景:
- ペロルシドAは,重要な生物学的活性を持つ複雑な天然製品です.
- ペロルシドAの合成には,特にラクトン環を形成する際に,ステレオ化学の正確な制御が必要です.
研究 の 目的:
- ダイアステロエーマー型デルタ・ラクトーンを製造するための新しい合成戦略を開発する.
- ステレオ選択的合成のための機械的に異なる乳酸化反応の有用性を実証する.
- (+) -ペロルシドA.の重要な断片にアクセスするには,
主な方法:
- 機械的に異なる2つのラクトニゼーション反応:古典的な酸/塩基触媒によるラクトニゼーションとオゾン溶解性ラクトニゼーションを使用しました.
- 中央ヒドロキシル群 (C5) を有する擬似対称基板を用いて,立体化学的結果を直接導いた.
- 5-ヒドロキシ-1,9-ディエステルと5-ヒドロキシ-1,10-ディエネのサイクル化のダイアステロ選択性を調査しました.
主要な成果:
- ダイステル基板の古典的な乳酸化により,主に1つのダイステロエーマーが得られました.
- ディエンの同位体のオゾノリティック・ラクトニゼーションにより,対極のダイアステロエーマーに高い選択性をもたらした.
- ラクトニゼーション反応の選択がC5位置でのステレオ化学的結果を決定することを示した.
結論:
- ダイアステロセレクティブデルタ-ラクトン合成のための多用途戦略が確立されました.
- 機械的に異なるラクトニゼーション反応は,立体化学に対する直交的な制御を提供します.
- このアプローチは, (+) -ペロルシドA合成に関連する断片を準備するための信頼できる方法を提供します.
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