Development of Multigram Scale Synthesis of Trifluoromethylthiolating Reagent: (bpy)CuSCF3

A practical and reproducible procedure for the efficient preparation of (bpy)CuSCF3 (1), a copper reagent for trifluoromethylthiolation reaction, is reported. All reaction parameters were optimized, and reagent 1 was synthesized in 26 g scale. Finally, the utility of the reagent 1 was highlighted in the synthesis of a Toltrazuril intermediate on a preparative scale.