No heat: The direct introduction of the trifluoromethylthio (SCF3) group into drug candidates has received significant attention. Herein, we report an alkali- and heat-free method for the trifluoromethylthiolation of aryl boronic acid substrates using a sulfonyl trifluoromethylthiolating reagent in the water phase. This method shows good tolerance towards various functional groups with satisfactory yields