Tetrahydrofuran → 4-(8-Chloro-quinolin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester

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Reaction Steps

In a 50 mL round-bottomed flask equipped with a N2 inlet septum was placed a stir bar, NaH (60% in mineral oil, 1.1 g, 30 mmol) and 4-hydroxy-piperidine-1-carboxylic acid isopropyl ester (0.93 g, 5 mmol). THF (anhydrous, 20 mL) was added to the mixture. The resulting suspension was stirred about 30 min at room temperature. 4,8-Dichloro-quinoline (1 g, 0.5 mmol) was then added in one portion. The mixture was stirred overnight under N2 at 80° C. and the resulting slurry turned slightly yellowish. The slurry was added CH2Cl2 and filtered. The filtrate was concentrated under vacuum to give the crude product. Purification by column chromatography gave 4-(8-chloro-quinolin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester as an off-white solid. 1H NMR (CDCl3, 400 MHz) δ 1.26 (d, 6H), 1.97 (m, 2H), 2.05 (m, 2H), 3.58 (m, 2H), 3.73 (m, 2H), 4.82 (m, 1H), 4.94 (m, 1H), 6.81 (d, 1H), 7.42 (t, 1H), 7.84 (d, 1H), 8.16 (d, 1H), 8.87 (d, 1H). Exact mass calculated for C18H21ClN2O3 348.12, found 349.2 (MH+)

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