Methanesulfonyl chloride → 1-(1-Azidoethyl)-3-bromo-5-chloro-2-methoxy-4-methylbenzene

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(3-bromo-5-chloro-2-methoxy-4-methylphenyl)ethanol (13.4 g, 47.9 mmol) in methylene chloride (150 mL), cooled at 0° C. was added N,N-diisopropylethylamine (14 mL, 80 mmol) followed by methanesulfonyl chloride (5.5 mL, 71 mmol). The mixture was stirred for 1 hour at 0° C. Water (100 mL) was added while cold. The organic layer was separated, washed with brine, dried over MgSO4, filtered and concentrated to dryness under reduced pressure. The resulting crude mesylate was dissolved in N,N-dimethylformamide (140 mL) and sodium azide (6.2 g, 96 mmol) was added. The reaction was stirred at room temperature for 2 hours. The reaction mixture was diluted with ethyl acetate and washed with saturated sodium bicarbonate solution, water and brine, dried over MgSO4, filtered and concentrated. The residue was purified on silica gel (eluting with 0-30% of ethyl acetate in hexanes) to afford the desired product (12.2 g, 82%). LCMS calculated for C10H11BrClO (M−N3)+: m/z=261.0, 263.0. found: 261.0, 263.0.

Provenance & Evidence