废止
化学
立体中心
分子内力
分子间力
级联
立体化学
组合化学
催化作用
药物化学
有机化学
分子
对映选择合成
色谱法
作者
Ajit P. Rathod,Balasaheb R. Borade,Pooja Ishvarappa Sambherao,Ravindar Kontham
摘要
An efficient protocol for constructing complex three dimensional polycyclic bridged chromano-furopyranones and pyrano-furopyranones (closely related to bioactive natural products) via bismuth(III)-catalyzed cascade annulation of hydroxy-pyranones and unsaturated γ-ketoesters is presented. This process involves intermolecular Michael addition, intramolecular hemiketalization, lactonization, formation of one C-C bond and two C-O bonds, rings, and contiguous stereocenters.
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