Acetyl chloride → N-[4-(2-Amino-2-methyl-propoxy)-3-(2-methyl-2H-pyrazol-3-yl)-phenyl]-4-chloro-benzamide

Participants

Reaction Steps

4-Chlorobenzoyl chloride (280-, 0.22 mmol) was added to a solution of 3-(2-methyl-2H-pyrazol-3-yl)-4-(2-methyl-2-nitropropoxy)aniline (58 mg, 0.20 mmol) and N,N-diisopropylethylamine 0.22 mmol) in dichloromethane (0.5 mL) and the mixture was stirred at room temperature. After 1 h, the mixture was diluted with dichloromethane, washed with 0.5M citric acid and saturated sodium bicarbonate, dried with sodium sulfate, filtered, and evaporated to dryness. The residue was dissolved in methanol (0.5 mL) and acetyl chloride (71 μl, 1.0 mmol) was added slowly while stirring. Zinc dust (65 mg, 1.0 mmol) was added in small portions, and the mixture was stirred at 55° C. After 2 h, the mixture was allowed to cool to room temperature, and diluted with methanol. The white precipitate was removed by filtration and washed with methanol. The combined washings were evaporated to dryness. The residue was suspended in 1M HCl, the solution was cooled on an ice bath, and made alkaline with ammonium hydroxide. The solution was extracted with ethyl acetate, and the extract was washed with brine, dried with sodium sulfate, filtered, and evaporated to dryness. The crude product was purified by RP-HPLC. The trifluoroacetate salt was dissolved in a mixture of ethyl acetate and saturated sodium bicarbonate. The organic layer was washed with brine, dried with sodium sulfate, and evaporated to dryness to afford the free base. The free base was dissolved in mixture of methanol and acetyl chloride (350-, 0.5 mmol) and the solution was evaporated to dryness to give the title compound as a hydrochloride salt (44 mg, 45%). LCMS m/z (%)=401.3 (M+H 37Cl 13.1%), 399.2 (M+H 35Cl 31.8%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.19 (s, 6H), 3.70 (s, 3H), 3.92 (s, 2H), 6.37 (d, J=1.77 Hz, 1H), 7.25 (d, J=9.09 Hz, 1H), 7.50 (d, J=1.77 Hz, 1H), 7.59-7.65 (m, 2H), 7.73 (d, J=2.53 Hz, 1H), 7.87 (dd, J=8.97, 2.65 Hz, 1H), 7.95-8.01 (m, 2H), 8.03 (s, 3H), 10.39 (s, 1H).

Provenance & Evidence