tert-butyl (3R,4R)-4-fluoro-3-hydroxypiperidine-1-carboxylate

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (5.46 g, 27.4 mmol) and triethylamine trihydrofluoride (4.42 g, 27.4 mmol) in DCE (4 mL) was stirred at 80° C. (bath) for 18 hours. After cooling to room temperature, saturated sodium bicarbonate (20 mL) and DCM (30 mL) were added. The organic phase was separated, washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1) to give trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.5 g, 58%) as a solid. After cooling to room temperature The organic phase was separated washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (5.46 g, 27.4 mmol) and triethylamine trihydrofluoride (4.42 g, 27.4 mmol) in DCE (4 mL) was stirred at 80° C. (bath) for 18 hours. After cooling to room temperature, saturated sodium bicarbonate (20 mL) and DCM (30 mL) were added. The organic phase was separated, washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1) to give trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.5 g, 58%) as a solid. After cooling to room temperature The organic phase was separated washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (5.46 g, 27.4 mmol) and triethylamine trihydrofluoride (4.42 g, 27.4 mmol) in DCE (4 mL) was stirred at 80° C. (bath) for 18 hours. After cooling to room temperature, saturated sodium bicarbonate (20 mL) and DCM (30 mL) were added. The organic phase was separated, washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1) to give trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.5 g, 58%) as a solid. After cooling to room temperature The organic phase was separated washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (5.46 g, 27.4 mmol) and triethylamine trihydrofluoride (4.42 g, 27.4 mmol) in DCE (4 mL) was stirred at 80° C. (bath) for 18 hours. After cooling to room temperature, saturated sodium bicarbonate (20 mL) and DCM (30 mL) were added. The organic phase was separated, washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1) to give trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.5 g, 58%) as a solid. After cooling to room temperature The organic phase was separated washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of tert-butyl 7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (5.46 g, 27.4 mmol) and triethylamine trihydrofluoride (4.42 g, 27.4 mmol) in DCE (4 mL) was stirred at 80° C. (bath) for 18 hours. After cooling to room temperature, saturated sodium bicarbonate (20 mL) and DCM (30 mL) were added. The organic phase was separated, washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1) to give trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.5 g, 58%) as a solid. After cooling to room temperature The organic phase was separated washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 1:1)

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

Procedure: A mixture of trans-tert-butyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (3.10 g, 14.1 mmol) and 4-methylbenzene-1-sulfonyl chloride (5.39 g, 28.3 mmol) in pyridine (20 mL) was stirred at room temperature for 18 hours. The pyridine was removed in vacuo, and the residue was dissolved in ethyl acetate (30 mL), washed with brine, dried (sodium sulfate) and concentrated in vacuo. The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1) to give trans-tert-butyl 4-fluoro-3-(tosyloxy)piperidine-1-carboxylate (3.95 g, 75%) as a solid. The pyridine was removed in vacuo the residue was dissolved in ethyl acetate (30 mL) washed with brine dried (sodium sulfate) concentrated in vacuo The residue obtained was purified by flash chromatography on silica gel (hexane:ethyl acetate 2:1)