Development of wide scope asymmetric synthesis of oxygen-bridged polycyclic compounds and its synthetic applications

点击翻译按钮获取中文摘要

Lewis acid catalyzed asymmetric cycloaddition reactions of cyclic carbonyl ylides generated from diazo carbonyl compounds were found to proceed not only by a normal electron demand type but also by an inverse electron demand type such as in the reaction with vinyl ethers and N-methylindoles with high levels of asymmetric induction. Thus a wide scope procedure for asymmetric syntheses of oxygen-bridged polycyclic compounds has been developed. With regard to a generality of diazo carbonyl substrates, the procedure could be applied for not only diazo compounds containing a benzene ring but also acyclic diazo diketones and the substrates containing a pyrrolidine ring. For the synthetic application, the synthesis of (+)-Tashiromine has been achieved.