Hydrochloric Acid → 2-Chloro-6-trifluoromethylbenzothiazole

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A mixture of 2-chloro-4-trifluoromethylaniline (15.0 g, 76.7 mmol) and potassium O-ethyl dithiocarbonate (29.5 g, 184.1 mmol) in 75 mL anhydrous.DMF was heated at 130° C. overnight under a nitrogen atmosphere. The reaction mixture was cooled to rt, and then 1 N HCl solution (200 mL) was added with stirring to induce precipitation. After the mixture was stirred for 30 minutes, the solid precipitate was collected by filtration and rinsed with water. The filter cake was dissolved in 100 mL EtOAc, and the solution was dried over Na2SO4. EtOAc was removed by rotary evaporation, and the residue was dried in vacuo to afford the desired product as a white solid (18.0 g, 99%). 1H NMR (DMSO-d6) δ 14.00 (bs, 1 H), 8.20 (s, 1 H), 7.70 (d, 1 H), 7.40 (d, 1 H); GC-EIMS m/z 235 (M+).

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