A microwave-assisted, organocatalytic domino Michael/Henry
condensation/Michael/aldol condensation reaction
has been developed. Employing acetaldehyde and nitroalkenes as substrates, this
quadruple cascade allows an efficient asymmetric synthesis of trisubstituted
cyclohexene carbaldehydes in moderate to good yields (25-45%)
and high enantioselectivities (ee = 89
to >99%). ESI-MS measurements were carried out
to support the proposed complex catalytic cycle.
organocatalysis - cascade reaction - Michael
addition - aldol condensation - cyclohexene carbaldehydes