Trifluoroacetic acid → N-[(1R,6R)-6-Amino-2,2-difluorocyclohexyl]-4-[6-(difluoromethoxy)pyrazolo[1,5-a]pyrimidin-3-yl]-5-methylthiophene-2-carboxamide

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Reaction Steps

tert-Butyl{(1R,2R)-2-[({4-[6-(difluoromethoxy)pyrazolo[1,5-a]pyrimidin-3-yl]-5-methylthiophen-2-yl}carbonyl)amino]-3,3-difluorocyclohexyl}carbamate (0.900 g, 1.61 mmol) was dissolved in dichloromethane (8 mL) and trifluoroacetic acid (1.50 mL, 19.5 mmol) added. The reaction was stirred at room temperature for 16 h. After deprotection was complete, the mixture was diluted with 1N NaOH. The aqueous layer was extracted 3× with dichloromethane. The organic layers were combined, dried with sodium sulfate, and concentrated under reduced pressure. The residue was purified by column chromatography (0-16% MeOH/DCM) to give the title compound (0.371 g, 0.811 mmol). LRMS (APCI) calc'd for (C19H19F4N5O2S) [M+H]+, 458.1; found 458.0. 1H NMR (CDCl3, 500 MHz) δ 8.66 (d, J=2.5, 1H), 8.48 (d, J=2.5, 1H), 8.26 (s, 1H), 7.92 (s, 1H), 7.06 (d, J=8.8, 1H), 6.61 (t, J=71.5, 1H), 4.45 (m, 1H), 3.32 (m, 1H), 2.57 (s, 3H), 2.17 (m, J=8.6, 1H), 1.47-1.92 (m, 5H).

Provenance & Evidence