Synthesis of oxa-bridged carbocycles via rhodium/Lewis acid catalyzed [3+3] and [4+3] cycloadditions of carbonyl ylides with donor-acceptor strained carbocycles

A method for cooperative rhodium/Lewis acid-catalyzed [3+3] and [4+3] cycloadditions of carbonyl ylides with donor-acceptor (D–A) strained carbocycles is described. It affords access to a wide range of structurally diverse...