Methanol → Methyl 3-[(2,6-dichlorophenyl)methyl]-5-(1-methylethyl)-4-isoxazolecarboxylate

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Reaction Steps

A solution of methyl isobutyrylacetate (1.93 g, 13.4 mmol) in tetrahydrofuran (2.7 mL) was stirred at 0° C. as 0.5 N sodium methoxide in methanol solution (27 mL, 13.5 mmol) was added. A solution of 2-(2,6-dichlorophenyl)-N-hydroxyethanimidoyl chloride (2.60 g, 11.18 mmol) in tetrahydrofuran (8.7 mL) was added and the solution was allowed to warm to room temperature and stir overnight. The mixture was concentrated then partitioned between water and ethyl acetate. The organic layer was dried with magnesium sulfate, filtered, and concentrated. The residue was purified by chromatography (silica gel, 0%-30% ethyl acetate in hexane) to provide the title compound (1.10 g, 30%). 1HNMR (DMSO-d6): δ 7.48 (d, J=8 Hz, 2H), 7.34 (t, J=8 Hz, 1H), 4.42 (s, 2H), 3.84 (s, 3H), 3.68 (septet, J=7 Hz, 1H), 1.24 (d, J=7 Hz, 6H).

Provenance & Evidence