Potassium Carbonate → 1-(1-(4-chloro-3-methoxyphenyl)piperidin-4-yl)-2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)ethanone

Participants

Reaction Steps

A mixture of 2-chloro-1-(1-(4-chloro-3-methoxyphenyl)piperidin-4-yl)ethanone (580 mg, 1.919 mmol; see Example 1a, Step 2), 5-methyl-3-(trifluoromethyl)-1H-pyrazole (576 mg, 3.84 mmol), potassium carbonate (796 mg, 5.76 mmol) and acetonitrile (20 mL) was stirred at RT for 12 h. After this time, the solvent was removed under reduced pressure and the resultant residue was partitioned between EtOAc (100 mL) and water (50 mL). The organic phase was washed with brine, dried (Na2SO4) and concentrated on a rotary evaporator to yield a residue. The residue was purified by flash chromatography using a 40 g silica gel cartridge and gradient elution from 10:1 Hex/EtOAc to 1:1 Hex/EtOAc. The fractions containing the product were pooled and concentrated on a rotary evaporator to give 1-(1-(4-chloro-3-methoxyphenyl)piperidin-4-yl)-2-(5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)ethanone (650 mg, 1.563 mmol, 81% yield) as clear oil. 1H-NMR (400 MHz, CDCl3) δ ppm 7.19 (1 H, d, J=8.57 Hz), 6.49 (1 H, d, J=2.42 Hz), 6.44 (1 H, dd, J=8.68, 2.53 Hz), 6.35 (1 H, s), 5.01-5.04 (2 H, m), 3.84-3.89 (3 H, m), 3.62-3.69 (2 H, m), 2.77 (2 H, td, J=12.03, 2.75 Hz), 2.58 (1 H, tt, J=11.29, 3.87 Hz), 2.21 (3 H, s), 1.99 (2 H, s), 1.80-1.91 (2 H, m).

Provenance & Evidence