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5-Bromo-3-bromomethylisothiazole (1.92 g, 7.5 mmol), triethylamine (1.57 mL, 11.2 mmol) and piperidine (1.5 mL, 15.0 mmol) in DCM (10 mL) were stirred for 16 h at ambient temperature. The reaction mixture was partitioned between water (50 mL) and ethyl acetate (75 mL). The organic phase was separated, dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to afford the title compound as a colourless oil (1.49 g, 97%) that was used in the next step without further purification. 1H NMR (CDCl3, 400 MHz): 7.25 (s, 1H), 3.59 (s, 2H), 2.46-2.33 (m, 4H), 1.62-1.53 (m, 4H), 1.48-1.38 (m, 2H).

1. customThe reaction mixture was partitioned between water (50 mL) and ethyl acetate (75 mL)
2. customThe organic phase was separated
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. customevaporated in vacuo