[4 + 2] Cycloaddition reactions catalyzed by a chiral oxazaborolidinium cation. Reaction rates and diastereo-, regio-, and enantioselectivity depend on whether both bonds are formed simultaneously.
The reaction rates and products in enantioselective Diels-Alder reactions with a range of dienophiles correlate with the expected degree of concertedness of bond formation in the transition state.
Mukherjee
Santanu
S
Department of Chemistry and Chemical Biology, Harvard University,12 Oxford Street, Cambridge, Massachusetts 02138, USA.
Corey
E J
EJ