Hydrochloric Acid → 3-(4-(4-Methoxyphenyl)piperidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid

Participants

Reaction Steps

To a solution of methyl 3-(4-(4-methoxyphenyl)piperidin-1-yl)-2-phenylquinoxaline-6-carboxylate (179.6 mg, 0.36 mmol, 1.00 equiv, 90%) in methanol (17 mL) was added a solution of sodium hydroxide (80 mg, 2.00 mmol, 5.00 equiv) in water (2 mL) dropwise with stirring. The resulting solution was stirred for 7 h at 50° C. in an oil bath, then the pH of the solution was adjusted to 3-4 with 1N hydrochloric acid. The resulting mixture was concentrated under vacuum, followed by washing with methanol yielding 81.9 mg (50%) of 3-(4-(4-methoxyphenyl)piperidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid.

Provenance & Evidence