Lewis acid-promoted carbon-carbon bond cleavage of aziridines: divergent cycloaddition pathways of the derived ylides.
Lewis acids are shown to cleave the carbon-carbon bond of activated aziridines at ambient temperature. The derived metal-coordinated azomethine ylides undergo cycloaddition reactions with electron-rich alkenes. Cyclic alkenes afford products that are formally [4+2] adducts most likely derived from a Mannich-type addition to the ylide, followed by intramolecular Friedel-Crafts alkylation. Alternatively, acyclic alkenes undergo [3+2] cycloaddition to give new pyrrolidine products.
Pohlhaus
Patrick D
PD
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
Bowman
Roy K
RK
Johnson
Jeffrey S
JS