Sodium Hydroxide → Furo[3,2-C]pyridine-6-carboxylic acid

関与物質

反応手順

Methyl furo[3,2-c]pyridine-6-carboxylate (1.55 g, 8.74 mmol) is dissolved in MeOH (30 mL) and H2O (15 mL), treated with 3 N NaOH (6.4 mL) and stirred at rt for 7 h. The mixture is concentrated to dryness, dissolved in H2O (10 mL) and acidified to pH 2 with concentrated HCl. The solution is concentrated to dryness, suspended in a smaller amount of water (7 mL) and the resulting solid collected via filtration (lot A). The filtrate is concentrated, triturated with water (3 mL) and the resulting solid collected via filtration (lot B). The filtrate from lot B is concentrated and carried on without further purification as an acid/salt mixture (lot C). Both lots A and B are dried in a vacuum oven at 50° C. for 18 h to afford 690 mg (48%) for lot A, 591 mg (42%) for lot B and 130 mg (10%) of furo[3,2-c]pyridine-6-carboxylic acid as yellow solids. MS (CI) m/z: 164 (M+H+).

情報源と証拠