Potassium Iodide → 6-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-7-methyl-3-(1,3-thiazol-2-yl)-1,2-benzoxazole-5-carboxylic acid

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Reaction Steps

A solution of methyl 2-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-4-fluoro-5-[(hydroxyimino)(1,3-thiazol-2-yl)methyl]-3-methylbenzoic acid (Intermediate 195, 0.31 g, 0.8 mmol), K2CO3 (0.4 g, 2.3 mmol) and potassium iodide (0.03 g, 0.2 mmol) in DMF (10 mL) was heated at 130° C. for 12 hours. Solvents were removed under vacuum and the residue was treated with 1.5N hydrochloric acid and extracted with ethyl acetate, which was dried over sodium sulfate. Removal of solvent by vacuum afforded product. Yield: 0.18 g (62%).

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