5-Hydroxy-2-Methyl-Piperidine-1-Carboxylic Acid Benzyl Ester

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of THF (200 mL) and MeOH (11 mL) was added LiBH4 (2 M, 89 mL, 0.18 mol). Some gas evolution and a small exotherm were observed. The reaction was aged at room temperature for 30 min before being cooled to −10° C.±benzyl 2-methyl-5-oxopiperidine-1-carboxylate (22.0 g, 0.089 mol) was then added dropwise, keeping the temperature below −5° C. The reaction was then aged at −10° C. for 30 min. The reaction was quenched by adding half-saturated, aqueous NaHCO3, then extracted with EtOAc. The layers were separated and the organics dried with MgSO4. The organics were concentrated to give crude ±benzyl-5-hydroxy-2-methylpiperidine-1-carboxylate as a crude, colorless oil. was then added dropwise the temperature below −5° C The reaction was then aged at −10° C. for 30 min The reaction was quenched by adding half-saturated aqueous NaHCO3, then extracted with EtOAc The layers were separated the organics dried with MgSO4 The organics were concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of THF (200 mL) and MeOH (11 mL) was added LiBH4 (2 M, 89 mL, 0.18 mol). Some gas evolution and a small exotherm were observed. The reaction was aged at room temperature for 30 min before being cooled to −10° C.±benzyl 2-methyl-5-oxopiperidine-1-carboxylate (22.0 g, 0.089 mol) was then added dropwise, keeping the temperature below −5° C. The reaction was then aged at −10° C. for 30 min. The reaction was quenched by adding half-saturated, aqueous NaHCO3, then extracted with EtOAc. The layers were separated and the organics dried with MgSO4. The organics were concentrated to give crude ±benzyl-5-hydroxy-2-methylpiperidine-1-carboxylate as a crude, colorless oil. was then added dropwise the temperature below −5° C The reaction was then aged at −10° C. for 30 min The reaction was quenched by adding half-saturated aqueous NaHCO3, then extracted with EtOAc The layers were separated the organics dried with MgSO4 The organics were concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of THF (200 mL) and MeOH (11 mL) was added LiBH4 (2 M, 89 mL, 0.18 mol). Some gas evolution and small exotherm were observed. The reaction was aged at room temperature for 30 min before being cooled to −10° C. with an acetone:ice bath. ±benzyl 2-methyl-5-oxopiperidine-1-carboxylate (22.0 g, 0.089 mol) was then added dropwise, keeping the temperature below −5° C. The reaction was then aged at −10° C. for 30 min. The reaction was quenched by adding half-saturated, aqueous NaHCO3, then extracted with EtOAc. The layers were separated and the organics dried with MgSO4. The organics were concentrated to give the titled compound as a crude, colorless oil. the temperature below −5° C The reaction was then aged at −10° C. for 30 min The reaction was quenched by adding half-saturated aqueous NaHCO3, then extracted with EtOAc The layers were separated the organics dried with MgSO4 The organics were concentrated