[OH:1][C:2]1[CH:3]=[N:4][O:5][CH:6]=1.[CH2:7](Br)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[CH2:7]([O:1][C:2]1[CH:3]=[N:4][O:5][CH:6]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1A mixture containing 200 mg of 4-hydroxyisoxazole in 10 ml of acetone together with 1.5 equivalents of benzyl bromide and 1.5 equivalents of potassium carbonate is stirred at about 25° C. for five hours. The solid is filtered and the filtrate concentrated to an oil. The crude material is purified by chromatography on silica gel.
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