Sodium Hydroxide → 4-{[tert-Butoxycarbonyl-(4-cyclohexylphenyl)amino]methyl}benzoic acid

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Reaction Steps

4-{[tert-Butoxycarbonyl-(4-cyclohexylphenyl)amino]methyl}benzoic acid methyl ester was suspended in ethanol (30 mL) and sodium hydroxide (4 N, 8.1 mL) was added. The reaction mixture was stirred overnight. The mixture was concentrated to dryness, suspended in water (100 mL), acidified with hydrochloric acid (8.5 mL, 4 N) and extracted with ethyl acetate (100 mL). The aqueous phase was extracted once more with ethyl acetate (30 mL) and the combined organic phases were washed with water (3×50 mL), dried with magnesium sulphate and concentrated in vacuo. The residue was crystallized from a mixture of ethyl acetate and n-heptane to afford 1.75 g of 4-{[tert-butoxycarbonyl-(4-cyclohexylphenyl)amino]methyl}-benzoic acid.

Provenance & Evidence