Dichloromethane → (4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl) methanone hydrochloride salt

Participants

Reaction Steps

To a mixture of tert-butyl 3-(4-(3,4-difluoro-2-(trifluoro-methyl)phenyl) piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate (37, 0.132 g, 0.26 mmol) and CH2Cl2 (1 mL) was added TFA (1 mL). The mixture stirred at ambient temperature for 2 h and was concentrated under reduced pressure. The residue was dissolved in CH2Cl2 and the solution was washed with saturated NaHCO3, dried over Na2SO4, filtered, and concentrated under reduced pressure. The resulting residue was chromatographed over silica gel (0-20% CH3OH in CH2Cl2) to give (4-(3,4-difluoro-2-(trifluoromethyl)phenyl) piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl) methanone (38) as a white solid (0.070 g, 66%): 1H NMR (500 MHz, CDCl3) δ7.36-7.31 (m, 1H), 7.12 (m, 1H), 4.82 (br, 1H), 4.38 (br, 1H), 4.11 (s, 2H), 4.09 (s, 2H), 3.24 (m, 2H), 2.89 (br, 1H), 1.93-1.68 (m, 4H); MS (ESI+) m/z 401 [M+H]+.

Provenance & Evidence