Water → N-(3-Bromo-6-cyano-2-hydroxy-5-methyl-4-styrylphenyl)-2,2-dimethylpropionamide

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A dichloromethane (1.0 ml) solution of N-(3-bromo-6-cyano-2-methoxy-5-methyl-4-styrylphenyl)-2,2-dimethylpropionamide (I-11) (34 mg, 79.6 μmol) was cooled at −78° C., a dichloromethane solution of 1 N tribromoborane (239 μl, 239 μmol) was dropwise added, followed by stirring at −78° C. for 70 minutes. Afterwards, this was heated up to −12° C. and stirred for 1 hour. The reaction liquid was put into cold water (50 ml), saturated brine (50 ml) was added, the intended product was extracted with ethyl acetate (50 ml×2). The organic layer was dried over anhydrous magnesium sulfate, concentrated under reduced pressure to obtain the entitled compound (32 mg, 96%) as a yellow white semi-solid.

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