Salicylic Acid → Benzyl 3-(2-hydroxybenzamido)butan-2-ylcarbamate

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To a mixture of benzyl 3-aminobutan-2-ylcarbamate (5.3 g, 23.8 mmol), 2-hydroxybenzoic acid (3.28 g, 23.8 mmol) and imidazole (1.62 g, 23.8 mmol) in EtOAc (180 mL) at 0° C. was slowly added a solution of DCC (4.90 g, 23.8 mmol) in EtOAc (20 mL). The reaction mixture was stirred (RT, 16 h), filtered and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel, eluting with PE-EtOAc (5:1) to afford benzyl 3-(2-hydroxybenzamido)butan-2-ylcarbamate (3.2 g, 40%) as a colorless oil. Mass calculated for C19H22N2O4=342.39; found: [M+H]+=343.2.

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