Enantioselective cyclization of enamide-ynes and application to the synthesis of the kopsifoline core
摘要:
We report the palladium-catalyzed enantioselective cyclization of 1,6-enamidynes to form spirocyclic ring systems. We applied this methodology to the concise synthesis of the skeletal core of the kopsifoline alkaloids. (C) 2013 Elsevier Ltd. All rights reserved.