propan-2-yl 4-(hydroxymethyl)piperidine-1-carboxylate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methanesulfonyl chloride (0.28 mL, 3.6 mmol) was added dropwise to a solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 600 mg, 3 mmol), triethylamine (0.627 mL, 4.5 mmol), and CH2—Cl2 (10 mL) at 0° C. The mixture was stirred at 0° C. for 30 min, then at ambient temperature for 2 h. The mixture was washed with water, and the organics were concentrated. The resulting crude material was mixed with 4-bromobenzenethiol (567 mg, 3 mmol) and K2CO3 (829 mg, 6 mmol) in DMF (10 mL), and the mixture was stirred at ambient temperature overnight. The mixture was charged with water, and extracted with EtOAc. The organics were dried over MgSO4, filtered, and the filtrate was concentrated. The crude product was purified by chromatography on a silica gel column using 0 to 10% EtOAc/hexanes to give 292 mg (26%) of 1-methylethyl 4-{[(4-bromophenyl)thio]methyl}-1-piperidinecarboxylate as a clear oil. 1H NMR (400 MHz, CDCl3): δ 7.37 (d, 2H, J=8.5 Hz), 7.15 (d, 2H, J=8.5 Hz), 4.95-4.82 (m, 1H), 4.15-4.09 (m, 2H), 2.80 (d, 2H, J=6.9 Hz), 2.72-2.60 (m, 2H), 1.85-1.77 (m, 2H), 1.70-1.60 (m, 1H), 1.24-1.08 (m, 8H); LRMS (ESI), m/z 372/374 (M+H). at ambient temperature for 2 h The mixture was washed with water the organics were concentrated the mixture was stirred at ambient temperature overnight extracted with EtOAc The organics were dried over MgSO4 filtered the filtrate was concentrated The crude product was purified by chromatography on a silica gel column

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

Procedure: A solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 0.5 g, 2.36 mmol) in CH2Cl2 (5 mL) was cooled to 0° C. Et3N (0.5 mL, 3.54 mmol) was added, followed by dropwise addition of methanesulfonyl chloride (0.2 mL, 2.60 mmol). The reaction mixture was allowed to warm up to ambient temperature and stirred for 1 h and diluted with CH2Cl2. The mixture was washed with water, saturated aqueous NaHCO3, brine and dried over Na2SO4, filtered, and the filtrate was concentrated to give 0.71 g of the crude 1-methylethyl 4-{[(methylsulfonyl)oxy]methyl}-1-piperidinecarboxylate as a light brown solid, which was used without further purification. 1H NMR (400 MHz, CDCl3): δ 4.90 (septet, 1H, J=6.2 Hz), 4.25-4.15 (m, 2H), 4.06 (d, 2H, J=6.6 Hz), 3.01 (s, 3H), 2.80-2.65 (m, 2H), 2.00-1.85 (m, 1H), 1.80-1.65 (m, 2H), 1.30-1.15 (m, 8H). The mixture was washed with water, saturated aqueous NaHCO3, brine dried over Na2SO4 filtered the filtrate was concentrated

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

Procedure: 1-Methylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (0.71 g, 58%) was prepared as a light yellow solid from 2-bromo-5-hydroxypyridine (0.60 g, 3.45 mmol), 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 0.71 g, 3.45 mmol) and Ph3P (0.92 g, 3.45 mmol) in THF (18 mL) followed by diisopropyl azodicarboxylate (0.75 g, 94%, 3.45 mmol) in THF (6 mL) in a manner similar to Example 1, Step 2. 1H NMR (400 MHz, CDCl3): δ 8.04 (bs, 1H), 7.36 (d, 1H, J=8.8 Hz), 7.15-7.05 (m, 1H), 4.91 (septet, 1H, J=6.2 Hz), 4.30-4.10 (m, 2H), 3.82 (d, 2H, J=6.1 Hz), 2.85-2.70 (m, 2H), 2.05-1.90 (m, 1H), 1.90-1.75 (m, 2H), 1.35-1.15 (m, 8H); LRMS (ESI), m/z 357/359 (M+H).

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

Procedure: Diisopropyl azodicarboxylate (9.1 mL, 46.27 mmol) in THF (15 mL) was added dropwise to a solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (7.76 g, 38.56 mmol), 4-bromophenol (6.67 g, 38.56 mmol) and Ph3P (13.15 g, 50.12 mmol) in THF (85 mL) at −20° C. The reaction mixture was allowed to warm to ambient temperature and stirred at ambient temperature overnight. The mixture was concentrated, and the residue was purified by chromatography on a silica gel column using 0 to 25% EtOAc/hexane to give the crude product. The crude product was taken up in Et2O (250 mL) and washed with 1N NaOH (aq). The organic extracts were dried over MgSO4, filtered, and the filtrate was concentrated to give 7.5 g (55%) of 1-methylethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate as a white solid. 1H NMR (400 MHz, CDCl3): δ7.35 (d, 2H, J=8.9 Hz), 6.75 (d, 2H, J=8.9 Hz), 4.96-4.83 (m, 1H), 4.24-4.14 (m, 2H), 3.75 (d, 2H, J=6.4 Hz), 2.81-2.71 (m, 2H), 2.02-1.87 (m, 1H), 1.85-1.75 (m, 2H), 1.33-1.13 (m, 8H); LRMS (ESI), m/z 356/358 (M+H). The mixture was concentrated the residue was purified by chromatography on a silica gel column to give the crude product washed with 1N NaOH (aq) The organic extracts were dried over MgSO4 filtered the filtrate was concentrated

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

Procedure: Isopropyl chloroformate (1.0M in toluene, 43.4 mL, 43.4 mmol) was added dropwise to a mixture of 4-piperidinemethanol (5 g, 43.4 mmol) and triethylamine (12.1 mL, 86.8 mmol) in CH2Cl2 (150 mL) at 0° C. over 20 min. The mixture was stirred at ambient temperature overnight. The mixture was washed with water, followed by brine. The organic layer was separated and dried over MgSO4, filtered, and the filtrate was concentrated. The crude product was purified by chromatography on a silica gel column using 0 to 5% MeOH/CH2Cl2 to give 7.76 g (89%) of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate as a clear oil. 1H NMR (400 MHz, CDCl3): δ 4.93-4.78 (m, 1H), 4.19-4.09 (m, 2H), 3.47 (d, 2H, J=6.2 Hz), 2.75-2.65 (m, 2H), 1.75-1.56 (m, 3H), 1.21 (d, 6H, J=6.2 Hz), 1.17-1.06 (m, 2H); LRMS (ESI), m/z 202 (M+H). The mixture was washed with water The organic layer was separated dried over MgSO4 filtered the filtrate was concentrated The crude product was purified by chromatography on a silica gel column

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methanesulfonyl chloride (0.28 mL, 3.6 mmol) was added dropwise to a solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 600 mg, 3 mmol), triethylamine (0.627 mL, 4.5 mmol), and CH2—Cl2 (10 mL) at 0° C. The mixture was stirred at 0° C. for 30 min, then at ambient temperature for 2 h. The mixture was washed with water, and the organics were concentrated. The resulting crude material was mixed with 4-bromobenzenethiol (567 mg, 3 mmol) and K2CO3 (829 mg, 6 mmol) in DMF (10 mL), and the mixture was stirred at ambient temperature overnight. The mixture was charged with water, and extracted with EtOAc. The organics were dried over MgSO4, filtered, and the filtrate was concentrated. The crude product was purified by chromatography on a silica gel column using 0 to 10% EtOAc/hexanes to give 292 mg (26%) of 1-methylethyl 4-{[(4-bromophenyl)thio]methyl}-1-piperidinecarboxylate as a clear oil. 1H NMR (400 MHz, CDCl3): δ 7.37 (d, 2H, J=8.5 Hz), 7.15 (d, 2H, J=8.5 Hz), 4.95-4.82 (m, 1H), 4.15-4.09 (m, 2H), 2.80 (d, 2H, J=6.9 Hz), 2.72-2.60 (m, 2H), 1.85-1.77 (m, 2H), 1.70-1.60 (m, 1H), 1.24-1.08 (m, 8H); LRMS (ESI), m/z 372/374 (M+H). at ambient temperature for 2 h The mixture was washed with water the organics were concentrated the mixture was stirred at ambient temperature overnight extracted with EtOAc The organics were dried over MgSO4 filtered the filtrate was concentrated The crude product was purified by chromatography on a silica gel column

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

Procedure: A solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 0.5 g, 2.36 mmol) in CH2Cl2 (5 mL) was cooled to 0° C. Et3N (0.5 mL, 3.54 mmol) was added, followed by dropwise addition of methanesulfonyl chloride (0.2 mL, 2.60 mmol). The reaction mixture was allowed to warm up to ambient temperature and stirred for 1 h and diluted with CH2Cl2. The mixture was washed with water, saturated aqueous NaHCO3, brine and dried over Na2SO4, filtered, and the filtrate was concentrated to give 0.71 g of the crude 1-methylethyl 4-{[(methylsulfonyl)oxy]methyl}-1-piperidinecarboxylate as a light brown solid, which was used without further purification. 1H NMR (400 MHz, CDCl3): δ 4.90 (septet, 1H, J=6.2 Hz), 4.25-4.15 (m, 2H), 4.06 (d, 2H, J=6.6 Hz), 3.01 (s, 3H), 2.80-2.65 (m, 2H), 2.00-1.85 (m, 1H), 1.80-1.65 (m, 2H), 1.30-1.15 (m, 8H). The mixture was washed with water, saturated aqueous NaHCO3, brine dried over Na2SO4 filtered the filtrate was concentrated

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

Procedure: 1-Methylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (0.71 g, 58%) was prepared as a light yellow solid from 2-bromo-5-hydroxypyridine (0.60 g, 3.45 mmol), 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (prepared as in Example 9, Step 1, 0.71 g, 3.45 mmol) and Ph3P (0.92 g, 3.45 mmol) in THF (18 mL) followed by diisopropyl azodicarboxylate (0.75 g, 94%, 3.45 mmol) in THF (6 mL) in a manner similar to Example 1, Step 2. 1H NMR (400 MHz, CDCl3): δ 8.04 (bs, 1H), 7.36 (d, 1H, J=8.8 Hz), 7.15-7.05 (m, 1H), 4.91 (septet, 1H, J=6.2 Hz), 4.30-4.10 (m, 2H), 3.82 (d, 2H, J=6.1 Hz), 2.85-2.70 (m, 2H), 2.05-1.90 (m, 1H), 1.90-1.75 (m, 2H), 1.35-1.15 (m, 8H); LRMS (ESI), m/z 357/359 (M+H).

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

Procedure: Diisopropyl azodicarboxylate (9.1 mL, 46.27 mmol) in THF (15 mL) was added dropwise to a solution of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate (7.76 g, 38.56 mmol), 4-bromophenol (6.67 g, 38.56 mmol) and Ph3P (13.15 g, 50.12 mmol) in THF (85 mL) at −20° C. The reaction mixture was allowed to warm to ambient temperature and stirred at ambient temperature overnight. The mixture was concentrated, and the residue was purified by chromatography on a silica gel column using 0 to 25% EtOAc/hexane to give the crude product. The crude product was taken up in Et2O (250 mL) and washed with 1N NaOH (aq). The organic extracts were dried over MgSO4, filtered, and the filtrate was concentrated to give 7.5 g (55%) of 1-methylethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate as a white solid. 1H NMR (400 MHz, CDCl3): δ7.35 (d, 2H, J=8.9 Hz), 6.75 (d, 2H, J=8.9 Hz), 4.96-4.83 (m, 1H), 4.24-4.14 (m, 2H), 3.75 (d, 2H, J=6.4 Hz), 2.81-2.71 (m, 2H), 2.02-1.87 (m, 1H), 1.85-1.75 (m, 2H), 1.33-1.13 (m, 8H); LRMS (ESI), m/z 356/358 (M+H). The mixture was concentrated the residue was purified by chromatography on a silica gel column to give the crude product washed with 1N NaOH (aq) The organic extracts were dried over MgSO4 filtered the filtrate was concentrated

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

Procedure: Isopropyl chloroformate (1.0M in toluene, 43.4 mL, 43.4 mmol) was added dropwise to a mixture of 4-piperidinemethanol (5 g, 43.4 mmol) and triethylamine (12.1 mL, 86.8 mmol) in CH2Cl2 (150 mL) at 0° C. over 20 min. The mixture was stirred at ambient temperature overnight. The mixture was washed with water, followed by brine. The organic layer was separated and dried over MgSO4, filtered, and the filtrate was concentrated. The crude product was purified by chromatography on a silica gel column using 0 to 5% MeOH/CH2Cl2 to give 7.76 g (89%) of 1-methylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate as a clear oil. 1H NMR (400 MHz, CDCl3): δ 4.93-4.78 (m, 1H), 4.19-4.09 (m, 2H), 3.47 (d, 2H, J=6.2 Hz), 2.75-2.65 (m, 2H), 1.75-1.56 (m, 3H), 1.21 (d, 6H, J=6.2 Hz), 1.17-1.06 (m, 2H); LRMS (ESI), m/z 202 (M+H). The mixture was washed with water The organic layer was separated dried over MgSO4 filtered the filtrate was concentrated The crude product was purified by chromatography on a silica gel column