tert-butyl 2,2-dioxo-1,3-dioxa-2lambda6-thia-8-azaspiro[4.5]decane-8-carboxylate

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,1-dimethylethyl 1,3-dioxa-2-thia-8-azaspiro[4.5]decane-8-carboxylate 2,2-dioxide (500 mg, 1.7 mmol) was taken into THF (5 mL) followed by addition of TBAF (1M in THF, 1.8 mL) and the resulting solution was stirred for 3 h at 40° C. The mixture was then cooled and partitioned with ethyl acetate and 20% aqueous citric acid. The organic solution was washed with brine then dried over anhydrous sodium sulfate, filtered and concentrated to afford tert-butyl 4-(fluoromethyl)-4-hydroxypiperidine-1-carboxylate (350 mg, 88% yield). GC-MS (EI) for C11H20FNO3: 233 (M+). BOC-group deprotection was carried out in a manner well established in the literature (see, Greene and Wuts, Protective Groups in Organic Synthesis, Wiley-Interscience) to give 4-(fluoromethyl)piperidin-4-ol hydrochloride salt as a colorless solid. The mixture was then cooled partitioned with ethyl acetate and 20% aqueous citric acid The organic solution was washed with brine then dried over anhydrous sodium sulfate filtered concentrated

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,1-dimethylethyl 1,3-dioxa-2-thia-8-azaspiro[4.5]decane-8-carboxylate 2,2-dioxide (500 mg, 1.7 mmol) was taken into THF (5 mL) followed by addition of TBAF (1M in THF, 1.8 mL) and the resulting solution was stirred for 3 h at 40° C. The mixture was then cooled and partitioned with ethyl acetate and 20% aqueous citric acid. The organic solution was washed with brine then dried over anhydrous sodium sulfate, filtered and concentrated to afford tert-butyl 4-(fluoromethyl)-4-hydroxypiperidine-1-carboxylate (350 mg, 88% yield). GC-MS (EI) for C11H20FNO3: 233 (M+). BOC-group deprotection was carried out in a manner well established in the literature (see, Greene and Wuts, Protective Groups in Organic Synthesis, Wiley-Interscience) to give 4-(fluoromethyl)piperidin-4-ol hydrochloride salt as a colorless solid. The mixture was then cooled partitioned with ethyl acetate and 20% aqueous citric acid The organic solution was washed with brine then dried over anhydrous sodium sulfate filtered concentrated