1,2-Dibromoethane → Tert-butyl 4-(4-fluorobenzyl)-4-hydroxypiperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a suspension of magnesium (1.2 g) and 1,2-dibromoethane (0.11 mL) in THF (30 mL) was added a solution of 4-fluorobenzyl chloride (6.3 mL) in THF (10 mL) at room temperature under a nitrogen atmosphere, and the mixture was stirred for 1 hr at the same temperature. The reaction mixture was cooled to −78° C., a solution of tert-butyl 4-oxopiperidine-1-carboxylate (5.0 g) in THF (10 mL) was added thereto, and the mixture was allowed to warm to room temperature, and stirred for 2 days. To the reaction mixture was added water at 0° C., and then saturated aqueous potassium sodium tartrate solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane), and recrystallized from ethyl acetate/hexane to give the title compound (4.8 g).

Provenance & Evidence