Sodium Sulfate → Tert-butyl 4-(1-(oxetan-3-yl)-piperidin-4-yl)-piperazine-1-carboxylate

Participants

Reaction Steps

In a 100 ml round-bottom flask 2 g (7.42 mmol) of 1-boc-4-(piperidin-4-yl)-piperazine and 1.07 g (14.85 mmol) of 3-oxetanone were dissolved in 30 ml of dichloromethane. 3.16 g (22.27 mmol) of sodium sulfate were added and the reaction was stirred for 10 min. Subsequently, 2.203 g (10.39 mmol) of sodium triacetoxyborohydride were added and the reaction was stirred for 5 min. pH was adjusted to 5-6 with acetic acid and the reaction was stirred over night. Then, 50 ml of water were added and the resulting two phases were separated. The organic phase was washed twice with water dried over MgSO4, filtered and evaporated. The resulting solid was digested in methyl-tert-butyl ether, filtered off, washed with 10 ml of methyl-tert-butyl ether and dried. Flash chromatography (silica gel/gradient from 0 to 20% methanol in dichloromethane) yielded 650 mg of the title compound as a yellowish solid.

Provenance & Evidence