An intramolecular-intermolecular cascade cyclization reaction via multi metal-carbene intermediates has been developed. This reaction uses catalytic amount of Nd(OTf)₃, which actives both alkyne and aldehyde moieties. This protocol provides a novel strategy for the synthesis of phenanthro[9,10-b]furans.

中文翻译：

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Nd（OTf）₃催化的分子内分子间级联环化反应：菲[9,10- b ]呋喃衍生物的获得途径

已经开发了通过多种金属-卡宾中间体的分子内-分子间级联环化反应。该反应使用催化量的Nd（OTf）₃，该酶同时激活炔烃和醛基。该方案为合成菲咯啉[9,10- b ]呋喃提供了一种新颖的策略。