Trifluoroacetic acid → 2-(3-Chloro-4-fluorophenyl)-6-cyclopropyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-3-carboxamide

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Reaction Steps

To a stirred solution of Intermediate 348H (0.43 g, 0.989 mmol) in DCM (8.0 mL) was added TFA (4.0 mL, 51.9 mmol) and the resulting solution was stirred at RT for 2 h. The reaction mixture was concentrated and the residue was extracted with DCM (10 mL), and washed successively with water, a saturated aq. NaHCO3 solution and brine. The organic layer was dried over Na2SO4, filtered and the filtrate concentrated under reduced pressure to afford Intermediate 3481 as an off-white solid (0.3 g, 67%). MS(ES): m/z=335 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 7.80-7.91 (m, 1H), 7.64-7.70 (m, 1H), 7.35-7.50 (m, 1H), 7.02-7.29 (m, 2H), 4.12-4.25 (m, 2H), 3.93 (d, J=16.56 Hz, 1H), 3.68-3.81 (m, 2H), 2.40 (br. s., 1H), 0.82-0.98 (m, 1H), 0.48 (d, J=8.03 Hz, 2H), 0.37 (d, J=5.02 Hz, 2H).

Provenance & Evidence