Methanol → 2-[(E)-2-(3-Butyl-5-methyl-isoxazol-4-yl)-vinyl]-4-methyl-thiazole-5-carboxylic acid

Participants

Reaction Steps

To a suspension of 2-[(E)-2-(3-butyl-5-methyl-isoxazol-4-yl)-vinyl]-4-methyl-thiazole-5-carboxylic acid methyl ester (150 mg, 0.47 mmol) in THF (1.5 mL) was added a solution of lithium hydroxide monohydrate (39 mg, 0.93 mmol) in water (1.5 mL) followed by methanol (1 mL) and the resulting mixture stirred at room temperature for 1 h. The mixture was then evaporated to half volume and then acidified to pH 4 with HCl (1 N) and cooled to 0° C. for 30 min. A solid precipitated and was filtered off and dried to afford the title compound (130 mg, 91%) which was obtained as a light yellow solid. MS: m/e=305.2 [M−H]−.

Provenance & Evidence