2-(2-bromo-5-chlorophenyl)ethyl methanesulfonate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2-(2-bromo-5-chloro-phenyl)ethanol (1.65 g, 7.00 mmol) [as prepared in preparation 6] and triethylamine (922 mg, 1.27 mL, 9.11 mmol) in DCM (20 mL) was cooled to 0° C. and methanesulfonyl chloride (883 mg, 597 μL, 7.71 mmol) was added. The mixture was stirred for 2 h and then diluted with DCM and washed sequentially with water and brine, the organic layer dried (MgSO4) and concentrated to afford 2-bromo-5-chlorophenethyl methanesulfonate as a yellow solid (2.11 g, 96%). 1H NMR (500 MHz, d6-DMSO) δ 7.67 (1H, d), 7.55 (1H, s), 7.32 (1H, d), 4.44 (2H, t), 3.13-3.36 (5H, m). washed sequentially with water and brine the organic layer dried (MgSO4) concentrated