1-Naphthaleneboronic acid → 5-Methyl-4-naphthalen-1-yl-oxazol-2-ylamine

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A mixture of trifluoro-methanesulfonic acid 2-tert-butoxycarbonylamino-5-methyl-oxazol-4-yl ester (100 mg), 1-naphthaleneboronic acid (61 mg) palladium (0) tetrakis(triphenylphosphine) (17 mg), potassium acetate (85 mg) and 1,4-dioxane (5 mL) was heated at 180° C. for 24 hours. The solvent was removed under reduced pressure and to the resulting yellow oil was added dichloromethane (18 mL) and trifluoroacetic acid (2 mL). The mixture was stirred at room temperature for 1 hour and then the solvent was removed under reduced pressure, the resulting oil was diluted with ethyl acetate and washed with a saturated solution of sodium hydrogen carbonate, brine, dried over magnesium sulfate, filtered and the solvent removed under reduced pressure to afford a brown oil. Purification by column chromatography afforded 5-methyl-4-naphthalen-1-yl-oxazol-2-ylamine (30) (9 mg, 14%) as a white solid. 1H NMR (DMSO-D6): 2.15 (3H, s), 6.5 (2H, br s), 7.4-7.5 (4H, m), 7.85-7.90 (2H, m), 8.2 (1H, m). Mass Spectrum (m/z): 225 (M+H)+.

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