Hydrochloric Acid → 6-[3-({[3-(1-Cyano-1-methylethyl)phenyl]carbonyl}amino)phenoxy]-2-[(cyclopropylcarbonyl)amino]-1,3-benzothiazole-7-carboxylic acid

Participants

Reaction Steps

Methyl 6-[3-({[3-(1-cyano-1-methylethyl)phenyl]carbonyl}amino)phenoxy]-2-[(cyclopropylcarbonyl)amino]-1,3-benzothiazole-7-carboxylate (570 mg, 1.02 mmol) produced in Example 46(iv) was dissolved in a mixed solvent of tetrahydrofuran (6 mL)/methanol (2 mL)/water (2 mL), lithium hydroxide monohydrate (150 mg, 3.66 mmol) was added, and the mixture was stirred at room temperature for 12 hr. The reaction mixture was neutralized with 1N hydrochloric acid, diluted with ethyl acetate (100 mL)/tetrahydrofuran (100 mL) and washed with water (100 mL). The organic layer was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (methanol/ethyl acetate=0/100→10/90), and the obtained solution was concentrated under reduced pressure. The residue was crystallized from ethyl acetate/n-hexane to give the title compound (300 mg, 54%) as a white powder.

Provenance & Evidence