Acetic Acid → 4-((2S,4R)-1-acetyl-4-((5-cyanopyridin-2-yl)amino)-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl)benzoic acid

関与物質

反応手順

A solution of methyl 4-((2S,4R)-1-acetyl-4-((5-cyanopyridin-2-yl)amino)-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl)benzoate (for a preparation see Intermediate 3) (1.0 g, 2.270 mmol) in methanol (15 mL) at room temperature was treated with aqueous sodium hydroxide solution (2N, 2.27 mL, 4.54 mmol) and the resulting mixture was stirred at this temperature for 24 h. The bulk of MeOH was evaporated in vacuo and the aqueous residue was treated with acetic acid (0.39 mL, 6.81 mmol) giving precipitate which was isolated by filtration and dried under vacuum at 40° C. to afford 4-((2S,4R)-1-acetyl-4-((5-cyanopyridin-2-yl)amino)-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl)benzoic acid (820 mg, 1.923 mmol, 85% yield) as a yellow solid. LCMS (HpH, 2 min), Rt=0.64 min, MH+=427.

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