反应详情

To a solution of 4-bromopiperidine hydrobromide (3.0 g, 12.2 mmol) in tetrahydrofuran (30 ml) were added 1-{[(benzyloxy)carbonyl]oxy}-2,5-pyrrolidinedione (3.20 g, 12.9 mmol), N-methylmorpholine (1.62 ml, 14.7 mmol) and 4-N,N-dimethylaminopyridine (30 mg) at room temperature, and stirred at room temperature for 16 hours. The reaction solution was poured into water and extracted with ethyl acetate. The organic layer was washed with a 1N-aqueous hydrochloric acid solution, dried over anhydrous magnesium sulfate and distilled under reduced pressure to remove the solvent, and the resulting residue was purified by a silica gel column chromatography (eluent: hexane/ethyl acetate=1/1) to obtain benzyl 4-bromo-1-piperidinecarboxylate (3.58 g, 98%).

1. extractionextracted with ethyl acetate
2. washThe organic layer was washed with a 1N-aqueous hydrochloric acid solution
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationdistilled under reduced pressure
5. customto remove the solvent
6. customthe resulting residue was purified by a silica gel column chromatography (eluent: hexane/ethyl acetate=1/1)