Scheme 3.
Asymmetric bioreduction of activated alkenes via a coupled-substrate approach. n.d.=not determined. aA trace of 2,3-epoxy-2,6,6-trimethylcyclohexane-1,4-dione was formed (≤3%), presumably due to spontaneous epoxidation of the C C-bond by H2O2 derived via enzyme-catalyzed reduction of O2.21bA trace of aniline was detected as side product (≤3%).