Diisopropylethylamine → (R)-tert-butyl 2-bromo-4-(1-cyclopropyl-5-(4-(2,2,2-trifluoroacetamido)azepan-1-yl)-1H-pyrazol-4-ylcarbamoyl)thiazol-5-ylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of (R)—N-(1-(1-cyclopropyl-4-nitro-1H-pyrazol-5-yl)azepan-4-yl)-2,2,2-trifluoroacetamide (0.725 g, 2.00 mmol) in MeOH (20 mL) was added 10% palladium on carbon (0.75 g, 7.07 mmol) and ammonium formate (0.507 g, 8.03 mmol). The mixture was heated at 80° C. for 3 hr. The mixture was filtered through Celite® and the filtrate concentrated under reduced pressure. The residue was re-dissolved in DCM (20 mL) and 2-bromo-5-(tert-butoxycarbonylamino)thiazole-4-carboxylic acid (0.74 g, 2.29 mmol), PyBOP (1.57 g, 3.01 mmol) and DIPEA (1 mL, 5.6 mmol) were added. The reaction mixture was stirred at room temperature for 18 hr. Water (20 mL) was added and stirring continued for 10 min. The layers were separated and the aqueous extracted with DCM (2×20 mL). The combined organic layers were passed through a phase separation cartridge and the solvent removed under reduced pressure. The residue was purified by silica gel column chromatography (0-100% EtOAc/isohexane) to afford (R)-tert-butyl 2-bromo-4-(1-cyclopropyl-5-(4-(2,2,2-trifluoroacetamido)azepan-1-yl)-1H-pyrazol-4-ylcarbamoyl)thiazol-5-ylcarbamate as a pale brown solid (0.98 g, 77% over two steps). 1H NMR (400 MHz, CDCl3) δ 10.26 (s, 1H), 8.43 (s, 1H), 7.71 (s, 1H), 6.47 (d, J=8.3 Hz, 1H), 4.25-4.15 (m, 1H), 3.47-3.35 (m, 3H), 3.29-3.13 (m, 2H), 2.46-1.57 (m, 6H), 1.52 (s, 9H), 1.23-1.17 (m, 2H), 1.12-0.96 (m, 2H).

Provenance & Evidence