反应详情

1-Benzyl-3-piperidinone (2.07 g, 10 mmol), 4-(imidazol-1-yl)aniline (1.73 g, 1.0 eq.), and Ti(OiPr)4 (3.72 mL, 1.25 eq.) were stirred at ambient temperature for 1.25 hours. The mixture was then diluted with absolute ethanol (10 mL) and NaCNBH3 (0.44 g, 0.67 eq.) was added. The resulting mixture was stirred for 20 hours. Water (2 mL) was added to the mixture with stirring and the resulting precipitate was filtered. Flash column chromatography on silical gel with 1-5% methanol in methylene chloride gave a crude product. Further purification by HPLC afforded 3-[(4-(imidazol-1-yl)phenyl)amino]-1-benzylpiperidine (569 mg), which was dissolved in methanol (10 mL) and treated with 10% Pd/C (400 mg) and ammonium formate (800 mg). The resulting mixture was heated at reflux for 4 hours. After cooling to ambient temperature, the mixture was filtered. Evaporation of the solvent in vacuo gave 3-[(4-(imidazol-1-yl)phenyl)amino]piperidine (330 mg, 1.36 mmol).

1. additionwas added
2. stirringwith stirring
3. filtrationthe resulting precipitate was filtered
4. customFlash column chromatography on silical gel with 1-5% methanol in methylene chloride gave a crude product
5. customFurther purification by HPLC