Lewis-acid-mediated ring-exchange reaction of dihydrobenzofurans and its application to the formal total synthesis of (−)-quinocarcinamide
作者:Hiroaki Chiba、Yuki Sakai、Shinya Oishi、Nobutaka Fujii、Hiroaki Ohno
DOI:10.1016/j.tetlet.2012.09.030
日期:2012.11
An unusual Lewis-acid-mediated ring-exchange reaction of dihydrobenzofurans is described. The fused tricyclic ring system is the key structural element for this reaction as it restricts C–N bond rotation and/or destabilizes the benzofuran ring. We achieved the formal total synthesis of (−)-quinocarcinamide using a combination of this reaction and the Au(I)-catalyzed 6-endo-dig hydroamination of an
描述了一种不寻常的路易斯酸介导的二氢苯并呋喃环交换反应。稠合三环系统是该反应的关键结构要素,因为它限制了C–N键的旋转和/或使苯并呋喃环不稳定。通过结合该反应和炔的Au(I)催化的6-内挖-加氢胺化反应,我们实现了(-)-喹啉酰胺的正式全合成