In this study a batch reactor process is compared to a flow chemistry approach for lipase catalysed resolution of the cyclopropyl ester (±)-3. (1R, 2R)-3 is a precursor of the amine (1R, 2S)-2 which is a key building block of the API ticagrelor. For both flow and batch operation, the biocatalyst could be recycled several times, whereas in the case of the flow process the reaction time was significantly reduced.2