Sodium hydride → 2-Amino-6-(((3S)-1-(3-methyl-1-oxobutyl)-3-piperidinyl)methoxy)benzonitrile

Participants

Reaction Conditions

Reaction Steps

A solution of (S)-1-(3-(hydroxymethyl)piperidin-1-yl)-3-methylbutan-1-one (Example 5d) (42 g, 210.75 mmol, 1.2 eq.) in anhydrous THF (300 mL) was added dropwise at 0° C. to a suspension of NaH (60% in mineral oil, 8.43 g, 273.97 mmol, 1.63 eq.) in anhydrous THF (600 mL). The mixture was warmed up to about 25° C. and stirred for 1 h while keeping the temperature below 25° C. A solution of 2-amino-6-fluorobenzonitrile (22.95 g, 168.6 mmol, 1 eq.) in THF (300 mL) was added dropwise. The reaction was heated slowly to reflux and stirred overnight. The mixture was cooled down to room temperature, concentrated to about 400 mL of residual material. Saturated ammonium chloride (200 mL) was added. After stirring vigorously for 15 minutes, EtOAc (800 mL) was added and stirring continued for additional 30 minutes. The organic phase was washed subsequently with water, brine and dried over Na2SO4. The solvent was removed under vacuum and the residue was chromatographed on silica gel (Hex/EtOAc to provide the desired product (44.6 g, 141.40 mmol, 83.87%). 1H NMR (400 MHz, DMSO-d6, 20° C.) δ 0.79-0.92 (3×d, J=6.4 Hz/each, 6H), 1.19-1.46 (m, 2H), 1.51-2.01 (m, 4H), 2.03-2.25 (m, 2H), 2.57 (dd, J=10.4, 12.8 Hz, 0.3H), 2.75-2.88 (m, 0.6H), 2.92-3.10 (m, 1H), 3.65-4.08 (m, 3.6H), 4.27-4.40 (dm, 0.3H), 5.98 & 6.00 (s & s, 2H), 6.18 (pseudo t, J=8.4 & 9.2 Hz, 1H), 6.32 (pseudo d, J=8.4 Hz, 1H), 7.11-7.21 (m, 1H). MS 316 (MH+)

Provenance & Evidence