Tris(dibenzylideneacetone)dipalladium (30 mg; 0.03 mmol), 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (62 mg; 0.1 mmol), sodium tert-butoxide (240 mg; 2.5 mmol), 1-bromo-4-trifluoromethoxy-benzene (410 mg; 1.7 mmol) and 4-amino-piperidine-1-carboxylic acid tert-butyl ester (421 mg; 2.1 mmol) are suspended in dry toluene (5 mL) and the mixture is irradiated in a mono-mode microwave oven for 30 minutes at 120° C. The mixture is then cooled down to room temperature, is diluted with ethyl acetate (15 mL), filtered over Celite and concentrated under reduced pressure. The crude residue is then diluted in dichloromethane (15 mL) and filtered over a short silica gel pad. The desired product is eluted from the silica gel pad (dichloromethane (150 mL) followed by dichloromethane:methanol 98:2 (100 mL)). The fractions of interest are collected, pooled and concentrated under reduced pressure to afford the desired product (396 mg; 1.1 mmol).
