Allene Carboxylates as Dipolarophiles in Rh‐Catalyzed Carbonyl Ylide Cycloadditions

Abstract

Face-to-face: Allene carboxylates can serve as efficient dipolarophiles for Rh-catalyzed carbonyl ylide cycloadditions (see scheme). The endo and exo products arise from cycloaddition on the same face of the allene, but opposite faces of the dipole. This facial selectivity results in the formation of two of the four possible diastereomers.