A Cascade Strategy Enables a Total Synthesis of (−)-Gephyrotoxin
作者:Shuyu Chu、Stephen Wallace、Martin D. Smith
DOI:10.1002/anie.201409038
日期:2014.12.8
A concise and efficient synthesis of (−)‐gephyrotoxin from L‐pyroglutaminol has been realized. The key step in this approach is a diastereoselective intramolecular enamine/Michael cascade reaction that forms two rings and two stereocenters and generates a stable tricyclic iminium cation. A hydroxy‐directed reduction of this intermediate plays a key role in establishing the required cis‐decahydroquinoline