Enzyme-catalyzed direct three-component aza-Diels-Alder reaction using hen egg white lysozyme.

The direct three-component aza-Diels-Alder reaction of aromatic aldehyde, aromatic amine, and 2-cyclohexen-1-one was catalyzed by hen egg white lysozyme for the first time. Under the optimized conditions investigated in this paper, the enzyme-catalyzed aza-Diels-Alder reaction gave yields up to 98% and stereoselectivity of endo/exo ratios up to 90:10.