Ligand-Induced Acceleration of the Intramolecular [3 + 2] Cycloaddition between Alkynes and Alkylidenecyclopropanes
作者:Juan Durán、Moisés Gulías、Luis Castedo、José L. Mascareñas
DOI:10.1021/ol0524095
日期:2005.12.1
L6 and several sterically robust phosphoramidites are excellent ligands for promoting the Pd-catalyzed [3 + 2] intramolecularcycloadditionbetweenalkylidenecyclopropanes and alkynes. The use of these ligands allows for low catalyst loadings and facilitates the otherwise sluggish cycloaddition of hept-6-ynylidenecyclopropane systems.