Palladium nanocatalyst assisted in situ regeneration of amino donor in a one-enzyme cascade

α-Chiral amines are key intermediates for scalable preparation of bioactive compounds; herein we present a novel palladium-based nanocatalyst capable of selectively catalyzing the reductive amination of carbonyl compounds, which enables the in situ regeneration of amino donors from wasteful co-products in a one-enzyme cascade using ω-transaminase, without the requirement of the expensive coenzyme NAD(P)H.