C1(OC)C=CC=CC=1.[Cl-].[Al+3].[Cl-].[Cl-].[CH3:13][O:14][N:15]=[C:16]([C:32]1[O:33][CH2:34][CH2:35][N:36]=1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[O:23]CC1C=CC(Cl)=CC=1>O>[CH3:13][O:14][N:15]=[C:16]([C:32]1[O:33][CH2:34][CH2:35][N:36]=1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[OH:23]Anisole (152 ml) and aluminium chloride (16.3 g, 122 mmol) were added to 2-(4-chlorobenzyloxy)phenyl 2-oxazolin-2-yl ketone O-methyloxime (19.08 g, 55.3 mmol), and the mixture was stirred under ice-cooling for 1.5 hours. After completion of the reaction, water (100 ml) was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to give 2-hydroxyphenyl 2-oxazolin-2-yl ketone O-methyloxime (6.82 g, 56.0%) as an oil.
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