反应详情

Convert 3-phenyl piperidine hydrochloride (0.652 g, 3.30 mmol) to the free base using ion exchange chromatography (methanol→2 M ammonia/methanol) and concentrate. Combine the free base with 6-(4-formyl-2-methyl-phenoxy)-nicotinonitrile (from step 1 above) (0.748 g, 3.29 mmol), sodium triacetoxyborohydride (1.05 g, 4.95 mmol), and acetic acid (0.30 mL, 5.24 mmol) in 1,2-dichloroethane (33 mL) and stir at ambient temperature. After 17 h, wash reaction mixture with saturated sodium bicarbonate (aq) (2×50 mL), dry over anhydrous magnesium sulfate, filter, and concentrate. Purify the residue by silica gel chromatography (hexanes→2:1 hexanes:ethyl acetate) to provide 0.878 g (70%) of the title compound as a white foam: 1H NMR (CDCl3): 8.46 (d, 1H, J=2.9 Hz), 7.91 (dd, 1H, J=2.9, 8.8 Hz), 7.34-7.19 (m, 7H), 6.99 (d, 2H, J=8.8 Hz), 3.52 (s, 2H), 3.06-2.94 (m, 2H), 2.86 (tt, 1H, J=3.9, 11.7 Hz), 2.13 (s, 3H), 2.10-1.91 (m, 3H), 1.84-1.68 (m, 2H), 1.48 (dq, 1H, J=4.9, 12.2 Hz).

1. concentrationconcentrate
2. washwash
3. customreaction mixture with saturated sodium bicarbonate (aq) (2×50 mL)
4. dry with materialdry over anhydrous magnesium sulfate
5. filtrationfilter
6. concentrationconcentrate
7. customPurify the residue by silica gel chromatography (hexanes→2:1 hexanes:ethyl acetate)