A method for producing cathine ((1S,2S)-norpseudoephedrine), in which, in a first reaction step, benzaldehyde is reacted with an acetyl donor according to formula (1), where R═H or COOH, by way of an (S)-selective lease to yield an enantiomer mixture according to formulas (2) and (3) and, in a second step, the compound according to formula (3) is reacted with an amine donor by way of an (S)-selective transaminase to yield (1S,2S)-norpseudoephedrine.
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