反应详情

A solution of 1-(4-aminophenyl)-N,N-dimethylpiperidine-4-carboxamide (4.2 g, 16.98 mmol) in 25 mL HBr in 20 mL of water was added a solution of NaNO2 (1.17 g, 16.98 mmol) in water (2 mL) slowly. The mixture was stirred at −10° C.˜0° C. for 30 minutes, and added dropwise to a solution of CuBr (1.34 g, 9.34 mmol) in 12 mL HBr in water (10 mL). Then the mixture was stirred at reflux for 2 hours. The mixture was partitioned between 2N NaOH and EA, washed with EA, dried over Na2SO4. The volatiles were removed in vacuo, and the residue was purified by chromatography with PE/EA (15:1˜2:1) to give 2.5 g of 1-(4-bromophenyl)-N,N-dimethylpiperidine-4-carboxamide.

1. stirringThen the mixture was stirred
2. temperatureat reflux for 2 hours
3. customThe mixture was partitioned between 2N NaOH and EA
4. washwashed with EA
5. dry with materialdried over Na2SO4
6. customThe volatiles were removed in vacuo
7. customthe residue was purified by chromatography with PE/EA (15:1˜2:1)