Development of a Continuous‐Flow Microreactor for Asymmetric Sulfoxidation Using a Biomimetic Manganese Catalyst

Asymmetric sulfoxidation catalyzed by a biomimetic manganese complex under continuous‐flow microreactor is described. The reaction is conducted in microreactor, it can rapidly (<4 min) oxidize a wide scope of sulfides with high yield (up to 91%) and excellent enantioselectivity (up to 99% ee), and allows shorter reaction times, easier scale‐up and lower catalyst loadings than its batchwise counterpart. Additionally, a convenient numbering‐up strategy for the scale‐up of asymmetric sulfoxidation has been developed which enables a direct scaling of the reaction to 5 g affording the corresponding sulfoxides within 20 min. magnified image