<p>To overcome the usually low productivities of the C&z.dbd;C bond bioreduction of α,β-unsaturated aldehydes we combined the <I>in situ</I> substrate feeding product removal (SFPR) technology with a cascade system comprising an isolated ene-reductase and a chemoselective alcohol dehydrogenase.</p><br><br><P>Graphic Abstract</P><P>The combination of isolated enzymes with resin adsorption allowed a productivity increase of two orders of magnitude in the bioreduction of α-substituted unsaturated aldehydes.<br><img src='http://pubs.rsc.org/ej/CC/2011/c1cc16014a/c1cc16014a-ga.gif'><br></P>