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0 °C

tert-Butyl 4-(2,4-difluorophenyl)-4-(hydroxymethyl)piperidine-1-carboxylate (220 mg, 0.67 mmol) and 1-Bromo-3-(bromomethyl)-5-(trifluoromethyl)benzene (450 mg, 1.41 mmol) were combined in tetrahydrofuran (2 mL) and cooled to 0° C. The reaction was treated with sodium tert-butoxide (75 mg, 0.355 mmol) and stirred at 0° C. for 20 min. The reaction was treated with another aliquot of sodium tert-butoxide (75 mg, 0.355 mmol), allowed to warm to room temperature, and stirred for 30 min. The reaction was diluted with 10% sodium bicarbonate and extracted with ethyl acetate (2×). The organic layers were pooled together, washed with brine (1×), dried over sodium sulfate, and concentrated. Column chromatography on silica gel (0%→25% ethyl acetate/hexanes) gave 200 mg (50%). Mass spec.: 586.04 (MH)+ LC tr=2.552 min. (Phenomenex-Luna 4.6×50 mm S10, 10% MeOH/90% H2O/0.1% TFA→90% MeOH/10% H2O/0.1% TFA Gradient Time=2 min, Flow rate=4 mL/min).

1. temperatureto warm to room temperature
2. stirringstirred for 30 min
3. extractionextracted with ethyl acetate (2×)
4. washwashed with brine (1×)
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated
7. customColumn chromatography on silica gel (0%→25% ethyl acetate/hexanes) gave 200 mg (50%)