Trifluoromethanesulfonic anhydride → (2-Cyano-5-methoxyphenyl)trifluoromethanesulphonate

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Reaction Steps

Trifluoromethanesulphonic anhydride (2.06 g) was added dropwise to a solution of 2-cyano-5-methoxyphenol (1.0 g) in dry pyridine (20 ml) at 0° C. under an atmosphere of argon. Volatile material was removed by evaporation and the residue was dissolved in ethyl acetate (30 ml). The solution was washed with water (60 ml) and saturated sodium chloride solution (30 ml) and dried (MgSO4). The solvent was removed by evaporation and the residue purified by flash chromatography, eluting with ethyl acetate/hexane (1:3 v/v), to give (2-cyano-5-methoxyphenyl)trifluoromethanesulphonate (1.53 g) as an oil; NMR (CDCl3): 3.9(s,3H), 6.95(d,1H), 7.0(d,1H), 7.7(d,1H).

Provenance & Evidence