p-Toluenesulfonic acid → HCID 57920158, compound

Participants

Reaction Steps

A solution of 2-[4-(2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-N-[1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-yl]-3-(1-fluoro-cyclopentyl)-propionamide (0.330 g, 0.60 mmol) in methanol (6 mL) was treated with p-toluenesulfonic acid (0.017 g, 0.09 mmol). The reaction mixture was stirred at room temperature overnight. The solvents were removed under vacuum and ethyl acetate was added to the residue. The resulting mixture was washed with saturated sodium bicarbonate, a saturated sodium chloride solution and dried over magnesium sulfate. The mixture was filtered and evaporated which afforded 2-[4-(2,6-difluoro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-N-[1-((R)-2,3-dihydroxy-propyl)-1H-pyrazol-3-yl]-3-(1-fluoro-cyclopentyl)-propionamide (0.260 g, 87%) as a light yellow solid: 1H NMR (300 MHz, DMSO-d6) δ ppm 1.51-1.96 (m, 8H), 2.10-2.43 (m, 2H), 3.22-3.32 (m, 2H), 3.69-3.94 (m, 2H), 4.09 (dd, J=13.3, 3.3 Hz, 1H), 4.33 (d, J=18.3 Hz, 1H), 4.53 (d, J=18.3 Hz, 1H), 4.71 (t, J=5.3 Hz, 1H), 4.94 (d, J=5.1 Hz, 1H), 5.02 (s, 1H), 5.05-5.13 (m, 1H), 6.41 (s, 1H), 7.29-7.50 (m, 3H), 7.54 (s, 1H), 10.81 (s, 1H) HR-ES-MS m/z calculated for C24H27F3N4O5 [M+H]+, 509.2007 observed 509.2009.

Provenance & Evidence