Hydrochloric Acid → HCID 58181233, compound

Participants

Reaction Conditions

Reaction Steps

To {4-[2-(2-acetylamino-1,3-thiazol-4-yl)ethyl]phenyl}acetic acid (6.00 g, 19.7 mmol) that was synthesized from N-(4-formyl-1,3-thiazol-2-yl)acetamide by Wittig reaction and hydrogenation reaction based on the method described in WO2006/28269 were added acetic acid (18 ml) and concentrated hydrochloric acid (24 ml), and the mixture was heated at 105-110° C. for 5 hrs. After cooling, the reaction mixture was concentrated to dryness. 5% Hydrogen chloride methanol solution (30 ml) was added to the residue, and the mixture was stirred at 40° C. for 1.5 hrs and at room temperature for 12 hrs. The reaction mixture was concentrated, saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted with ethyl acetate. The combined organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. Diisopropyl ether was added to the residue, and the precipitate was collected by filtration, washed with diisopropyl ether and dried under reduced pressure to give methyl{4-[2-(2-amino-1,3-thiazol-4-yl)ethyl]phenyl}acetate (5.36 g, yield 98%) as a white solid.

Provenance & Evidence