Water → tert-butyl (+/-)-4-(4-(5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxamido)-1-methyl-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (±)-4-(4-amino-1-methyl-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylate (400 mg, 2.05 mmol), 5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxylic acid (630 mg, 2.46 mmol), HATU (0.83 g, 8.19 mmol) in DMF (15 mL) was added TEA (1.5 mL). The reaction mixture was stirred at 25° C. for 20 hours and poured into water (100 mL). The mixture was extracted with EtOAc (50 mL×2). The combined organic layers was washed with water (50 mL×2) and brine (30 mL×2), dried over Na2SO4, filtered, and concentrated under reduced pressure to give a residue. The residue was purified by silica gel chromatography using DCM/MeOH (1:1) as eluting solvents to afford tert-butyl (±)-4-(4-(5-(tert-butoxycarbonylamino)-2-(2,6-difluorophenyl)thiazole-4-carboxamido)-1-methyl-1H-pyrazol-5-yl)-2-methylpiperazine-1-carboxylate (280 mg, 52%) as white solid. 1H NMR (500 MHz, CDCl3) δ (ppm): 10.32 (s, 1H), 8.70 (s, 1H), 7.80 (s, 1H), 7.38-7.35 (m, 1H), 7.06-7.03 (m, 2H), 4.34 (s, 1H), 3.94-3.97 (m, 1H), 3.81 (s, 3H), 3.67-3.40 (m, 1H), 3.20-3.25 (m, 2H), 3.04-3.06 (m, 1H), 2.88-2.90 (m, 1H), 1.55 (s, 9H), 1.47 (s, 9H), 1.34-1.36 (d, J=6.4 Hz, 3H); MS (ESI) m/z=434 (M+H+).

Provenance & Evidence