tert-Butanol → 1,1-Dimethylethyl 4-fluoro-4-(4-fluorobenzoyl)-1-piperidinecarboxylate

Participants

Reaction Conditions

Reaction Steps

4-(4-Fluoro-benzoyl)-piperidine-1-carboxylic acid tert-butyl ester in 0.5 mL of DMF was added to a solution at 0° C. containing 0.5 mL of tBuOH, (0.109 mg, 0.651 mmol) tBuOK and 2 mL of DMF. After 20 min stirring at 0° C., N-Fluorobenzenesulfonimide (0.246 g, 0.781 mmol) was added portionwise. The reaction was stirred at 0° C. during 45 min. and (0.55 g, 0.33 mmol) of tBuOK were added at 0° C. and 10 min later (0.123 g, 0.390 mmol) of N-Fluorobenzenesulfonimide. Each 0.5 h two more additions of (0.55 g, 0.33 mmol) tBuOK and (0.123 g, 0.390 mmol) N-Fluorobenzenesulfonimide were repited. 1 h later of the last addition the reaction was quenched with 4 mL of water and the DMF was removed under vacuum. The water was extracted with ethyl acetate and the combined organic phases were purified with column chromatography on silica using n-heptane-EtOAc (3:1). The product fractions were concentrated to give 0.122 g (0.375 mmol, 58% yield) of a yellow oil. MS (m/e): 326.1 (M+H+).

Provenance & Evidence