[F:1][C:2]([F:13])([F:12])[CH:3]([C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[CH:7][CH:6]=1)O.N1C=CC=CC=1.S(Cl)([Cl:22])=O>C1(C)C=CC=CC=1>[Cl:22][CH:3]([C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[CH:7][CH:6]=1)[C:2]([F:13])([F:12])[F:1]To a cooled (ice bath) mixture of 4-(2,2,2-trifluoro-1-hydroxyethyl)phenol (4.3 g, 22 mmol) and anhydrous pyridine (1.8 ml, 22 mmol) in toluene was added thionyl chloride (SOCl2) (2.3 ml, 31 mmol) drop wise via a syringe. After stirred for 1 h at 0° C., the reaction was heated at 70° C. for 2 h. At this point, reaction did not go completion, indicated by LCMS. Heating was continued for 16 h. Reaction was quenched with ice water. The resulted mixture was diluted with EtOAc. The organic layer was washed with saturated Na2CO3, water and brine. After dried over Na2 SO4, the solution was filtered and concentrated. The residue was purified on a silica gel column (5-10% EtOAc/hexane) giving the title compound as a light yellow oil. MS m/z: 211 (M+1).
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