Potassium Hydroxide → 2-[4-(8-Hydroxy-2,2,4,4-tetramethyl-chroman-6-ylethynyl)-phenyl]-2-methyl-propionic acid

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Reaction Conditions

Reaction Steps

A solution of 2-[4-(8-hydroxy-2,2,4,4-tetramethyl-chroman-6-ylethynyl)-phenyl]-2-methyl-propionic acid methyl ester (Intermediate 23, 0.035 g, 0.087 mmol) in methanol (2 mL) and tetrahydrofuran (1 mL) was treated with a 1M solution of potassium hydroxide (2 mL, 4 mmol) and the resulting reaction mixture was stirred at 80° C. for 2 h. The volatiles were evaporated in vacuo to a residue that was neutralized with saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The organic phase was washed with water and brine, and dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo to afford the title product as a yellow solid (0.034 g, 100%).

Provenance & Evidence