Diethyl Ether → (S)-1-(3-(hydroxymethyl)piperidin-1-yl)-3-methylbutan-1-one

Temperature

0 °C

(S)-piperidin-3-ylmethanol hydrochloride (10 g, 65.95 mmol) in water (25 mL) was treated dropwise at 0° C. with a solution of NaOH (13.2 g, 330 mmol, 5 eq.) in water (25 mL). The mixture was stirred for 15 min and a solution of isovaleryl chloride (15.90 g, 131.9 mmol, 2 eq.) in anhydrous THF (25 mL) was added dropwise while stirring vigorously. After 30 minutes at 0° C. the reaction was slowly warmed up to room temperature and stirred overnight. Et2O (500 mL) was added to the reaction mixture with vigorous stirring. The organic layer was separed and washed with brine, dried over Na2SO4 and concentrated to give a residue that was purified by chromatography on silica (Hex/EtOAc 0-100 to yield the desired compound as a colorless oil (16.27 g, 82.62 mmol, 94%). 1H NMR (400 MHz, DMSO-d6, 20° C.) δ 0.88 (pseudo d, J=6.4 Hz, 6H), 1.06-1.75 (m, 5H), 1.88-2.05 (m, 1H), 2.07-2.23 (m, 2H), 2.30 (dd, J=10.8, 12.8 Hz, 0.5H), 2.64 (ddd, J=3.2, 10.8, 13.2 Hz, 0.5H), 2.78 (dd, J=10.4, 13.2 Hz, 0.5H), 2.93 (ddd, J=2.4, 11.6, 13.6 Hz, 0.5H), 3.14-3.35 (m, 2H), 3.70-3.85 (m, 1H), 4.08-4.18 (dm, 0.5H), 4.31-4.40 (dm, 0.5H), 4.49 (t, J=5.2 Hz, 0.5H), 4.58 (t, J=5.2 Hz, 0.5H). MS 200 (MH+).

1. stirringwhile stirring vigorously
2. stirringstirred overnight
3. washwashed with brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. customto give a residue that
7. customwas purified by chromatography on silica (Hex/EtOAc 0-100

ORD record

ord-ba3e02e8fc6a455886222769e0d80bfa

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09420814B2