Palladium-Catalyzed [4 + 3] Intramolecular Cycloaddition of Alkylidenecyclopropanes and Dienes
作者:Moisés Gulías、Juan Durán、Fernando López、Luis Castedo、Jose L. Mascareñas
DOI:10.1021/ja0756467
日期:2007.9.1
Octa-5,7-dienylidenecyclopropanes undergo [4 + 3] intramolecularcycloaddition reactions upon treatment with appropriate palladium catalysts to give stereochemically rich bicyclo[5.3.0]octane systems in a completely diastereoselective manner.
Intramolecular Cyclocarbonylation of Cyclopropylidenyl Aldehydes Mediated by Molybdenum Carbonyl Complex
作者:Chan-Mo Yu、Young-Taek Hong、Seok-Keun Yoon、Joon-Hwan Lee
DOI:10.1055/s-2004-830849
日期:——
A novel procedure for the synthesis of cis-bicyclic spirocyclopropanelactones from cyclopropylidenyl aldehydes via the molybdenum-mediated cyclocarbonylation is described. The use of (C7H8)Mo(CO)3 with DMSO to promote the reaction results in an efficient and convenient protocol for the three-component assembly in high yields.