Triethylamine → 3-[(Pyridine-2-carbonyl)-amino]adamantane-1-carboxylic acid methyl ester

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To a round bottom flask was added 3-amino-adamantane-1-carboxylic acid methyl ester hydrochloride (20.0 g, 81.4 mmol) and methylene chloride (500 mL) and the solution was cooled at 0° C. To this solution was then added triethylamine (57 mL, 0.41 mol) followed by picolinoyl chloride hydrochloride (15.2 g, 85.4 mmol; TCI America, Wellesley Hills, Mass., USA) and the reaction was stirred at 0° C. for 30 minutes, then at room temperature for 6 hours. To the reaction was added saturated aqueous sodium bicarbonate (500 mL) and the biphasic mixture was stirred vigorously for a few minutes, then transferred to a 2-L separatory funnel. The mixture was extracted, the layers separated and the aqueous layer was extracted again with methylene chloride (2×200 mL). The combined organic layers were washed with brine (300 mL), dried over sodium sulfate, filtered and concentrated under reduced pressure to afford 24.8 g (97%) of the title compound, 3-[(pyridine-2-carbonyl)-amino]-adamantane-1-carboxylic acid methyl ester, as a pale brown solid. 1H NMR (400 MHz, CDCl3) δ 8.54-8.49 (m, 1H), 8.16 (dt, J=7.8, 1.0 Hz, 1H), 7.96 (br s, 1H), 7.83 (td, J=7.8, 1.8 Hz, 1H), 7.40 (ddd, J=7.6, 4.8, 1.3 Hz, 1H), 3.66 (s, 3H), 2.34-2.30 (m, 2H), 2.29-2.23 (m, 2H), 2.17-2.13 (m, 4H), 1.97-1.80 (m, 4H), 1.78-1.62 (m, 2H). ESI-MS m/z: 315.0 (M+H)+.

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