Dimethyl Sulfoxide → tert-Butyl 4-(2-oxoethyl)piperidine-1-carboxylate

Participants

Reaction Steps

Dimethyl sulfoxide (7.43 mL, 0.105 mol) was added to oxalyl chloride (5.53 mL, 0.0654 mol) in methylene chloride (244.2 mL) at −78° C. After 10 min, tert-butyl 4-(2-hydroxyethyl)piperidine-1-carboxylate (10.0 g, 0.0436 mol) in methylene chloride (488.4 mL) was added and the resultant mixture was stirred at −78° C. for 30 min. Triethylamine (30.4 mL, 0.218 mol) was then added and the mixture was stirred for 5 h with the temperature allowed to gradually warm up to room temperature. After being quenched with water, the mixture was extracted with methylene chloride. The organic layers were combined, washed with brine, dried over MgSO4, evaporated to dryness and used directly in next step. LCMS (M+Na) 250.0.

Provenance & Evidence