反应详情

To a solution of 7-bromomethyl-benzo[b]thiophene (0.63 g, 2.8 mmol, 1 eq) and 1,1-dimethylethyl 4-[(2-methylpropyl)amino]piperidine-1-carboxylate (0.71 g, 2.8 mmol, 1 eq) in acetonitrile (25 ml) is added potassium carbonate (0.62 g, 4.4 mmol, 1.6 eq). The mixture is heated to reflux for 16 hours. The solution is filtered and the solvent removed in vacuo. The resulting oil is purified on a 40 g Redisep column using a gradient of 0-20% ethyl acetate/iso-hexane to give 1,1-dimethylethyl 4-{[(benzothien-7-yl)methyl]-(2-methylpropyl)amino}-piperidine-1-carboxylate as an oil (0.65 g, 40%); mass spectrum (LCMS): m/z=403.3 (M++1), Rt=4.40 (6 minute gradient); 1H NMR (300 MHz, CDCl3): δ=7.79-7.65 (1 H, m), 7.46-7.40 (1 H, m), 7.37-7.30 (3 H, m), 4.18-4.06 (4H, m), 3.90 (2 H, s), 2.67-2.44 (3 H, m), 2.32-2.22 (2 H, m), 1.87-1.37 (8 H, m), 144 (4H, s) and 0.92-0.83 (6 H, m).

1. temperatureThe mixture is heated
2. temperatureto reflux for 16 hours
3. filtrationThe solution is filtered
4. customthe solvent removed in vacuo
5. customThe resulting oil is purified on a 40 g Redisep column