Water → 2-(3-{[(4-Chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}azetidin-1-yl)-1,3-benzothiazole-7-carboxylic acid

Participants

Reaction Steps

Ethyl 2-(3-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}azetidin-1-yl)-1,3-benzothiazole-7-carboxylate obtained in Example (224c) (350 mg, 0.81 mmol) was dissolved in methanol (8 mL). A 2 N aqueous lithium hydroxide solution (4.03 mL, 8.07 mmol) was added, and the mixture was stirred at room temperature for 18 hours. Water was added to the reaction solution, and then the mixture was washed with ethyl acetate. A 1 N aqueous hydrochloric acid solution (8 mL) was added to the aqueous layer, and then the solvent was evaporated under reduced pressure. The resulting residue was suspended and washed in methanol. Following filtration, the resulting solid was washed with water to obtain 191 mg of the title compound as a white solid (58%).

Provenance & Evidence