N-Boc-3-[(1-Cbz-4-piperidyl)oxy]aniline → 1-Cbz-4-(3-aminophenoxy)-piperidine

Participants

Reaction Conditions

Reaction Steps

4-(3-tert-Butoxycarbonylamino-phenoxy)-piperidine-1-carboxylic acid benzyl ester (11.8 g, 27.6 mmol) is dissolved in a solution of trifluoroacetic acid in dichloromethane (25% v/v, 20 mL). The reaction mixture is stirred at 22° C. for 60 min. After removal of the solvent, the oily residue is dissolved in dichloromethane (250 mL) and neutralized with 0.2 N aqueous sodium hydroxide solution (250 mL) and extracted with dichloromethane (10×100 mL) followed by ethyl acetate (5×100 mL). The combined organic phases are dried over anhydrous sodium sulfate. After removal of solvent, the crude product is purified on silica gel chromatography with dichloromethane-methanol to give a light brown oil (4.84 g, 54%, ES+(m/z) 327.3 [M+H]).

Provenance & Evidence