Tetrahydrofuran → 3-[(Pyridine-2-carbonyl)-amino]adamantane-1-carboxylic acid

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反応手順

To a round bottom flask was added 3-[(pyridine-2-carbonyl)-amino]-adamantane-1-carboxylic acid methyl ester (24.8 g, 78.9 mmol), tetrahydrofuran (250 mL), water (250 mL) and lithium hydroxide monohydrate (14.9 g, 355 mmol) and the mixture was stirred vigorously at room temperature for 25 hours. The crude mixture was concentrated under reduced pressure to remove most of the tetrahydrofuran, then the aqueous solution was diluted with water (200 mL) and the pH was adjusted to about 3-4 by adding solid citric acid monohydrate. A voluminous white precipitate appeared which was filtered, washed with water and dried under high vacuum at 50° C. to afford 22.1 g (93%) of the title compound, 3-[(pyridine-2-carbonyl)-amino]-adamantane-1-carboxylic acid, as a white solid. 1H NMR (400 MHz, CDCl3) δ 8.55-8.50 (m, 1H), 8.18 (d, J=7.7 Hz, 1H), 7.97 (br s, 1H), 7.85 (td, J=7.8, 1.8 Hz, 1H), 7.42 (ddd, J=7.6, 4.8, 1.3 Hz, 1H), 2.35-2.31 (m, 2H), 2.31-2.25 (m, 2H), 2.25-2.09 (m, 4H), 2.00-1.86 (m, 4H), 1.80-1.64 (m, 2H). ESI-MS m/z: 301.0 (M+H)+.

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