Chemo‐ and Enantioselective Brønsted Acid‐Catalyzed Reduction of α‐Imino Esters with Catecholborane

The chemo‐ and enantioselective reduction of α‐imino esters with catecholborane has been developed employing 10 mol% of an enantiopure BINOL‐based phosphoric acid as organocatalyst. Various differently substituted aromatic α‐amino acid derivatives can be achieved in almost quantitative yields and very good to excellent enantioselectivities of up to 96% ee under mild reaction conditions.