3-Bromo-5-(trifluoromethyl)benzyl 4-((tert-butoxycarbonyl)amino)piperidine-1-carboxylate (Example 63, step 2) (214 mg, 0.445 mmol), zinc cyanide (26.1 mg, 0.222 mmol) and Pd(PPh3)4 (20.5 mg, 0.018 mmol) were dissolved in DMF (4 ml) and the vial flushed with nitrogen. The mixture was heated in the microwave at 150° C. for 10 mins, then cooled and diluted with EtOAc (30 ml). This was washed with a saturated solution of brine, dried over MgSO4, filtered and concentrated under reduced pressure. Purification by chromatography on a 4 g silica column using 0-50% EtOAC/hexanes as eluent gave the title compound.
