Access to Polycyclic Alkaloid-Like Structures by Coupling the Passerini and Ugi Reactions with Two Sequential Metal-Catalyzed Cyclizations
作者:Martina Spallarossa、Luca Banfi、Andrea Basso、Lisa Moni、Renata Riva
DOI:10.1002/adsc.201600638
日期:2016.9.15
yielding steps by combining the Ugi or Passerini multicomponent reactions with two metal‐catalyzed cyclizations: an intramolecular Tsuji–Trost reaction of the isocyanide‐derived amide followed by a ring‐closing metathesis. Scaffold diversity may be explored by the appropriate choice of starting unsaturated isocyanides. The Tsuji–Trost cyclization proceeds with moderate to good diastereoselectivity, and the
通过将Ugi或Passerini多组分反应与两种金属催化的环化反应结合在一起,仅需三个高产率步骤即可制备类似于某些天然生物碱的复杂多环化合物:异氰化物衍生的酰胺的分子内Tsuji-Trost反应,然后进行闭环易位。支架分集可以通过启动键式不饱和异氰化物的适当选择加以探讨。Tsuji–Trost环化反应具有中等至良好的非对映选择性,并且在大多数情况下,主要的非对映异构体是以纯净形式分离的。