甲基 4-(羟甲基)哌啶-4-羧酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: To a solution of Boc-Gly-OH (331 mg, 1.89 mmol, 1.1 equiv.) in DMF (1 mL) was added HBTU (718 mg, 1.89 mmol, 1.1 equiv.), followed by addition of methyl 4-(hydroxymethyl)piperidine-4-carboxylate (1.72 mmol, 1 equiv.) and DIEA (749 μL, 4.30 mmol, 2.5 equiv.) at rt. The reaction mixture was stirred for 1 h. The mixture was partitioned between EtOAc and H2O. The organic layer was washed by saturated NaHCO3, water and brine, dried over Na2SO4, and concentrated. The resulting residue was purified by column chromatography to give methyl 1-(2-(tert-butoxycarbonylamino)acetyl)-4-(hydroxymethyl)piperidine-4-carboxylate (560 mg, 98%, two steps). LRMS (M-Boc+H+) m/z 231.1. The mixture was partitioned between EtOAc and H2O The organic layer was washed by saturated NaHCO3, water and brine dried over Na2SO4 concentrated The resulting residue was purified by column chromatography

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

实验步骤: To a solution of Boc-Gly-OH (331 mg, 1.89 mmol, 1.1 equiv.) in DMF (1 mL) was added HBTU (718 mg, 1.89 mmol, 1.1 equiv.), followed by addition of methyl 4-(hydroxymethyl)piperidine-4-carboxylate (1.72 mmol, 1 equiv.) and DIEA (749 μL, 4.30 mmol, 2.5 equiv.) at rt. The reaction mixture was stirred for 1 h. The mixture was partitioned between EtOAc and H2O. The organic layer was washed by saturated NaHCO3, water and brine, dried over Na2SO4, and concentrated. The resulting residue was purified by column chromatography to give methyl 1-(2-(tert-butoxycarbonylamino)acetyl)-4-(hydroxymethyl)piperidine-4-carboxylate (560 mg, 98%, two steps). LRMS (M-Boc+H+) m/z 231.1. The mixture was partitioned between EtOAc and H2O The organic layer was washed by saturated NaHCO3, water and brine dried over Na2SO4 concentrated The resulting residue was purified by column chromatography

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

实验步骤: To a solution of 1-tert-butyl 4-methyl 4-(hydroxymethyl)piperidine-1,4-dicarboxylate (470 mg, 1.72 mmol, 1.0 equiv.) in MeOH (1 mL) was added HCl (4 M in dioxane, 1 mL). The mixture was stirred at rt for about 1 h and concentrated to dryness to give methyl 4-(hydroxymethyl)piperidine-4-carboxylate, which was used without further purification. LRMS (M+H+) m/z 174.0. concentrated to dryness

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: To a solution of Boc-Gly-OH (331 mg, 1.89 mmol, 1.1 equiv.) in DMF (1 mL) was added HBTU (718 mg, 1.89 mmol, 1.1 equiv.), followed by addition of methyl 4-(hydroxymethyl)piperidine-4-carboxylate (1.72 mmol, 1 equiv.) and DIEA (749 μL, 4.30 mmol, 2.5 equiv.) at rt. The reaction mixture was stirred for 1 h. The mixture was partitioned between EtOAc and H2O. The organic layer was washed by saturated NaHCO3, water and brine, dried over Na2SO4, and concentrated. The resulting residue was purified by column chromatography to give methyl 1-(2-(tert-butoxycarbonylamino)acetyl)-4-(hydroxymethyl)piperidine-4-carboxylate (560 mg, 98%, two steps). LRMS (M-Boc+H+) m/z 231.1. The mixture was partitioned between EtOAc and H2O The organic layer was washed by saturated NaHCO3, water and brine dried over Na2SO4 concentrated The resulting residue was purified by column chromatography

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

实验步骤: To a solution of 1-tert-butyl 4-methyl 4-(hydroxymethyl)piperidine-1,4-dicarboxylate (470 mg, 1.72 mmol, 1.0 equiv.) in MeOH (1 mL) was added HCl (4 M in dioxane, 1 mL). The mixture was stirred at rt for about 1 h and concentrated to dryness to give methyl 4-(hydroxymethyl)piperidine-4-carboxylate, which was used without further purification. LRMS (M+H+) m/z 174.0. concentrated to dryness