Facile Synthesis of Bicyclic and Tricyclic Skeletons by Cycloisomerizations of Hept-1-en-6-ynes and 4,9-Diheteradodeca-1,11-dien-6-ynes, Followed by [4 + 2] Cycloadditions
作者:Lonneke J. van Boxtel、Stefanie Körbe、Mathias Noltemeyer、Armin de Meijere
reaction with methyl acrylate, occurred with intramolecular transesterification to give the tricyclic lactones 11 (37%) and 16 (15%), respectively. Tricyclic systems containing up to three heteroatoms could be obtained from the corresponding dodeca-1,11-dien-6-ynes, by palladium-catalyzed cycloisomerization followed by intramolecular [4 + 2] cycloaddition. The scope and limitations of this single-operation