J. Christoffers et al., Construction of quaternary stereocenters by nickel-catalysis of asymmetricMichael reactions, EUR J ORG C, (5), 2000, pp. 701-705
Quaternary stereocenters were constructed with an enantioselectivity of up
to 91% ee under aerobic conditions and at ambient temperature in the Michae
l reaction of beta-dicarbonyl compounds and methyl vinyl ketone with Ni(OAc
)(2). 4H(2)O and optically active trans-1,2-diaminocyclohexane as a chiral
catalyst.