反应详情

A mixture of ethyl pipecolinate hydrochloride (10 g, 52 mmol), benzylbromide (7 mL, 57 mmol) and potassium carbonate (15 g, 114 mmol) in DMF (80 mL) was stirred at room temperature overnight. The solvent was removed in vacuo. The residue was partitioned between dichloromethane (100 mL) and water (50 mL). The aqueous layer was extracted with dichloromethane (2×100 mL), dried over Na2SO4, then evaporated to give a yellow oil. The crude product was chromatographed (500 g silica gel) eluting with a stepgradient of 8%-15% ethyl acetate in hexane. Pure fractions were combined to give title compound (12.3 g, 96%) as a colorless oil.

1. customThe solvent was removed in vacuo
2. customThe residue was partitioned between dichloromethane (100 mL) and water (50 mL)
3. extractionThe aqueous layer was extracted with dichloromethane (2×100 mL)
4. dry with materialdried over Na2SO4
5. customevaporated
6. customto give a yellow oil
7. customThe crude product was chromatographed (500 g silica gel)
8. washeluting with a stepgradient of 8%-15% ethyl acetate in hexane