反应详情

To a solution of 4-ethoxycarbonyl-4-benzylpiperidine (495 mg) in water (5 mL) was added sodium nitrite (276 mg) and acetic acid (201 μL) and the mixture was stirred at room temperature overnight. To the reaction mixture was added an aqueous saturated sodium hydrogencarbonate solution and the mixture was stirred and extracted with chloroform. The extract was concentrated in vacuo and the resultant crude product was purified by column chromatography on silica gel (solvent: hexane/ethyl acetate=85/15 to 80/20) and dried in vacuo to give 4-ethoxycarbonyl-4-benzyl-1-nitrosopiperidine (565 mg, yield: 100%) as a colorless solid. To a solution of the product (565 mg) in methanol (3 mL) was added zinc powder (654 mg) and then added acetic acid (3 mL) under ice-cooling and the mixture was stirred at room temperature for 3 hours. The reaction mixture was filtered and the filtrate was concentrated in vacuo. To the residue was added an aqueous saturated sodium hydrogencarbonate solution and chloroform and the mixture was stirred and extracted with chloroform. The extract was dried over magnesium sulfate and filtered. The filtrate was concentrated in vacuo to give 1-amino-4-benzyl-4-ethoxycarbonylpiperidine (508 mg, yield: 97%) as a colorless viscidity.

1. stirringthe mixture was stirred
2. extractionextracted with chloroform
3. concentrationThe extract was concentrated in vacuo
4. customthe resultant crude product was purified by column chromatography on silica gel (solvent: hexane/ethyl acetate=85/15 to 80/20)
5. customdried in vacuo