Trifluoroacetic acid → HCID 68577370, compound

Participants

Reaction Steps

To a solution of 1,1-dimethylethyl 4-{[(1-benzothien-7-yl)methyl]-(2-methylpropyl)amino}-piperidine-1-carboxylate (0.66 g, 1.6 mmol, 1 eq) in dichloromethane (10 ml) is added anisole (2 ml) and trifluoroacetic acid (2 ml). The solution is stirred at room temperature for 16 h. The solvent and trifluoroacetic acid are removed in vacuo. The resulting oil is taken up in methanol and loaded onto an SCX-2 (10 g) column. The column is washed with methanol (50 ml). Basic material is then eluted using 2M ammonia in methanol (50 ml). Removal of solvent from the ammonia/methanol mixture under vacuum, gave the desired compound (0.34 g, 75%) as an oil. This is taken up in diethyl ether (5 ml) and a solution of fumaric acid (0.13 g, 1 eq) in hot methanol (1 ml) is added. The mixture is left at room temperature for 1 hr. The resulting precipitate is collected by filtration to give a white solid, which is dried in a vacuum oven at 40° C. for 16 hours. This gives the title product as a white solid (0.24 g, 35%); mass spectrum (LCMS): m/z=303.1 (M+30 1), Rt=4.72 (12 min gradient); 1H NMR (300 MHz, MeOD): δ=7.81-7.71 (1 H, m), 7.59-7.51 (1 H, m), 7.42-7.29 (3 H, m), 6.69 (2H, s), 3.97 (2 H, s), 3.46-3.38 (2 H, m), 2.96-2.75 (3 H, m), 2.35 (2 H, d), 2.18-2.01 (2 H, m), 1.95-1.65 (3 H, m) and 0.90 (6 H, d).

Provenance & Evidence