Trifluoroacetic acid → 6-Amino-1-(2,3-difluorobenzyl)-4-(2,2,2-trifluoroethyl)-1,4-diazepan-5-one

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Trifluoroacetic acid (2.5 mL) was added to a solution of tert-butyl 1-(2,3-difluorobenzyl)-5-oxo-4-(2,2,2-trifluoroethyl)-1,4-diazepan-6-ylcarbamate (62 mg, 0.142 mmol) in dichloromethane (5 mL). After 1 h, the solution was concentrated. Saturated aqueous sodium bicarbonate solution was added and the mixture was extracted with dichloromethane (3×). The combined organic extracts were washed with saturated brine, dried over magnesium sulfate, filtered and concentrated to give the title compound (45 mg). MS 338 (M+1).

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