Continuous-Flow Synthesis of Phenothiazine Antipsychotics: A Feasibility Study

The continuous flow synthesis of a model phenothiazine antipsychotic is presented herein, using 3-chloropropionyl chloride as a central building block. The basic phenothiazine-derived scaffold is (atom)-efficiently and mildly synthesized with the aim to present continuous flow technology as a contributor to fast and efficient syntheses of challenging APIs, that are nowadays experiencing supply disruptions and global shortages.