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0 °C

A slurry of 58.6 g (0.355 mol) of 2-(4-aminophenyl)propionicacid and 500 ml of methylene chloride was treated with 90.11 ml (77.13 g, 0-710 mol) of trimethylsilyl chloride and was heated to reflux for 120 min. The reaction mixture was cooled to 0° C. and treated with 184.44 ml (107.77 g, 1.065 mol) of triethylamine. After stirring for 5 minutes, this mixture was treated with a solution of 70.45 g (0.355 mol) of O-acetylsalicyloyl chloride and 150 ml of methylene chloride. The reaction mixture was warmed to 25° C. and stirred for 64 hr. The volatiles were removed in vacuo. The residue was stirred in 2N aqueous sodium hydroxide for one hour and acidified with 2 M aqueous sulfuric acid. The solid was recrystallized twice from ethanol/water to give a tan solid. Isolation by filtration afforded 53.05 g of (52% yield) of 2-(4-(N-salicyloyl)aminophenyl)propionic acid.

1. temperaturewas heated
2. temperatureto reflux for 120 min
3. temperatureThe reaction mixture was warmed to 25° C.
4. stirringstirred for 64 hr
5. customThe volatiles were removed in vacuo
6. stirringThe residue was stirred in 2N aqueous sodium hydroxide for one hour
7. customThe solid was recrystallized twice from ethanol/water
8. customto give a tan solid
9. filtrationIsolation by filtration