Asymmetric Total Synthesis of Andranginine and Absolute Configuration of Natural Product Isolated from Kopsia arborea

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  • アンドランギニンの不斉全合成と天然物の絶対立体配置について
  • アンド ランギニン ノ フセイ ゼン ゴウセイ ト テンネンブツ ノ ゼッタイ リッタイ ハイチ ニ ツイテ

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Abstract

<p>Andranginine, a pentacyclic monoterpenoid indole alkaloid having hexahydroquinoline-ring and azepine fused structure, was first isolated as a racemate from Craspidospermum verticillatum in 1974. On the other hand, our andranginine isolated from Kopsia arborea exhibited optical activity. In order to find out the mystery on absolute configuration of andranginine, we carried out the asymmetric total synthesis. The first asymmetric total synthesis of andranginine utilizing asymmetric Morita-Baylis-Hillman reaction and diastereoselective intramolecular Diels-Alder reaction has revealed that natural andranginine isolated from K. arborea existed as a scalemic mixture.</p>

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