Trifluoroacetic acid → N-(azetidin-3-yl)-2-[[7-(pentafluoroethyl)isoquinolin-1-yl]amino]acetamide

Into a 8 mL sealed tube, was placed a solution of tert-butyl 3-(2-[[7-(pentafluoroethyl)isoquinolin-1-yl]amino]acetamido)azetidine-1-carboxylate (as prepared in the previous step, 100 mg, 0.21 mmol, 1.00 equiv) in dichloromethane (5 mL), TFA (0.5 g). The resulting solution was stirred for 5 h at 0° C. The resulting mixture was concentrated under vacuum. The residue was washed with 3×5 mL of ether. This resulted in 0.12 g (crude) of N-(azetidin-3-yl)-2-[[7-(pentafluoroethyl)isoquinolin-1-yl]amino]acetamide as a white solid.