A mixture of 50 mg (0.16 mmol) 3-(SR)-((4-phenyl)piperidin-1-yl)methyl-4-(SR)-phenylpyrrolidine (from Example 30, Step A) and 37 mg (0.31 mmol) of phenylacetaldehyde and 100 mg 4 A powdered molecular sieves in 3 mL of MeOH was treated with 18 mg (0.28 mmol) of sodium cyanoborohydride and 2 drops of HOAc and stirred at rt for 18 h. The mixture was filtered onto a pad of Celite; the pad and flask were rinsed well with MeOH (25 mL). The filtrate was concentrated in vacuo and the residue was partitioned between 25 mL of EtOAc and 15 mL of sat'd NaHCO3 and the layers were separated. The organic layer was dried over MgSO4 and concentrated in vacuo. Flash chromatography on 15 g of silica gel using 2:1 v/v hexanes/EtOAc afforded 32 mg (48%) of the title compound as an oil. 1H NMR (500 MHz, CDCl3): δ1.66-2.04 (6H), 2.42-3.13 (15H), 7.20-7.37 (15H). Mass Spectrum (NH3 -CI): 427 (M+1).
