(1-methylsulfonylpiperidin-2-yl)methanol

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Dess-Martin periodinane (21 g, 50 mmol) was added to a solution of (1-(methylsulfonyl)piperidin-2-yl)methanol (4.9 g, 25.4 mmol) in anhydrous methylene chloride (125 mL). The reaction was stirred for 24 hours, filtered, and concentrated in vacuo. The crude residue was purified by silica gel column chromatography (25-75% ethyl acetate in hexanes) to provide a white waxy solid (1.1 g, 24% yield). 1H NMR (CDCl3, 300 MHz) δ 9.56 (s, 1H), 4.61-4.58 (br d, 1H, J=6.3 Hz), 3.75-3.68 (m, 1H), 3.13-3.04 (td, 1H, J=12.0, 3.2 Hz), 2.97 (s, 3H), 2.33-2.22 (m, 1H), 1.89-1.55 (m, 4H), 1.27-1.21 (m, 1H). filtered concentrated in vacuo The crude residue was purified by silica gel column chromatography (25-75% ethyl acetate in hexanes)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Ethyl 1-(methylsulfonyl)piperidine-2-carboxylate (6.9 g, 29.3 mmol) in anhydrous tetrahydrofuran (40 mL) was added slowly to a stirring suspension of lithium aluminum hydride (1.5 g, 40 mmol) in anhydrous tetrahydrofuran (80 mL) kept at 0° C. with an external ice bath. After fifteen minutes, the ice bath was removed and the reaction was allowed to warm to ambient temperature and stirred for an additional 4.5 hours. The mixture was cooled to 0° C., and water (1.5 mL) was added dropwise, followed by aqueous sodium hydroxide (1.5 mL), and water (4.5 mL). The mixture was stirred for 15 mins at room temperature, followed by the addition of magnesium sulfate and additional stirring. The mixture was filtered through Celite, washed three times with ether, and the combined organic fractions concentrated under reduced pressure. The crude residue was passed through a pad of silica gel, washing with ethyl acetate, to give the desired product as a clear liquid (4.9 g, 87%). 1H NMR (CDCl3, 300 MHz) δ 4.06-4.03 (m, 1H), 3.96-3.92 (dd, 1H, J=11.1, 9.3 Hz), 3.73-3.68 (br d, 1H, J=14.1 Hz), 3.61-3.56 (dd, 1H, J=11.1, 4.8 Hz), 3.12-3.03 (br t, 1H, J=12.1 Hz), 2.96 (s, 3H), 2.17 (br s, 1H), 1.74-1.47 (m, 6H). kept at 0° C. with an external ice bath After fifteen minutes the ice bath was removed The mixture was cooled to 0° C. water (1.5 mL) was added dropwise The mixture was stirred for 15 mins at room temperature followed by the addition of magnesium sulfate and additional stirring The mixture was filtered through Celite washed three times with ether the combined organic fractions concentrated under reduced pressure washing with ethyl acetate