benzyl N-[2-oxo-2-(propan-2-ylamino)ethyl]carbamate

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

Procedure: To a solution of N-Cbz-glycine (20.9 g, 100 mmol) in THF (400 mL) at 0° C. was added N-methylmorpholine (NMM) (12.1 mL, 110 mmol) and i-butylchloroformate (13 mL, 100 mmol). The resultant mixture was stirred at 0° C. for 2 min and then i-propylamine (9.4 mL, 110 mmol) was added. The reaction mixture was warmed to room temperature and stirred at this temperature for 16 h. The mixture was filtered through a pad of Celite and concentrated in vacuo. The crude residue was dissolved in ethyl acetate (500 mL) and washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL). The organic layer was dried (MgSO4), filtered and concentrated in vacuo to afford (isopropylcarbamoylmethyl)carbamic acid benzyl ester (24.5 g, 98 mmol, 98%) as a white solid which was used without further purification in the next reaction. The mixture was filtered through a pad of Celite concentrated in vacuo The crude residue was dissolved in ethyl acetate (500 mL) washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL) The organic layer was dried (MgSO4) filtered concentrated in vacuo

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

Procedure: To a solution of N-Cbz-glycine (20.9 g, 100 mmol) in THF (400 mL) at 0° C. was added N-methylmorpholine (NMM) (12.1 mL, 110 mmol) and i-butylchloroformate (13 mL, 100 mmol). The resultant mixture was stirred at 0° C. for 2 min and then i-propylamine (9.4 mL, 110 mmol) was added. The reaction mixture was warmed to room temperature and stirred at this temperature for 16 h. The mixture was filtered through a pad of Celite and concentrated in vacuo. The crude residue was dissolved in ethyl acetate (500 mL) and washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL). The organic layer was dried (MgSO4), filtered and concentrated in vacuo to afford (isopropylcarbamoylmethyl)carbamic acid benzyl ester (24.5 g, 98 mmol, 98%) as a white solid which was used without further purification in the next reaction. The mixture was filtered through a pad of Celite concentrated in vacuo The crude residue was dissolved in ethyl acetate (500 mL) washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL) The organic layer was dried (MgSO4) filtered concentrated in vacuo

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

Procedure: To a solution of N-Cbz-glycine (20.9 g, 100 mmol) in THF (400 mL) at 0° C. was added N-methylmorpholine (NMM) (12.1 mL, 110 mmol) and i-butylchloroformate (13 mL, 100 mmol). The resultant mixture was stirred at 0° C. for 2 min and then i-propylamine (9.4 mL, 110 mmol) was added. The reaction mixture was warmed to room temperature and stirred at this temperature for 16 h. The mixture was filtered through a pad of CELITE™ and concentrated in vacuo. The crude residue was dissolved in ethyl acetate (500 mL) and washed with 1N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL). The organic layer was dried (MgSO4), filtered and concentrated in vacuo to afford (isopropylcarbamoylmethyl)carbamic acid benzyl ester as a white solid (24.5 g, 98 mmol, 98%) which was used without further purification. The mixture was filtered through a pad of CELITE™ concentrated in vacuo The crude residue was dissolved in ethyl acetate (500 mL) washed with 1N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL) The organic layer was dried (MgSO4) filtered concentrated in vacuo

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

Procedure: To a solution of N-Cbz-glycine (20.9 g, 100 mmol) in THF (400 mL) at 0° C. was added N-methylmorpholine (NMM) (12.1 mL, 110 mmol) and i-butylchloroformate (13 mL, 100 mmol). The resultant mixture was stirred at 0° C. for 2 min and then i-propylamine (9.4 mL, 110 mmol) was added. The reaction mixture was warmed to room temperature and stirred at this temperature for 16 h. The mixture was filtered through a pad of CELITE™ and concentrated in vacuo. The crude residue was dissolved in ethyl acetate (500 mL) and washed with 1N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL). The organic layer was dried (MgSO4), filtered and concentrated in vacuo to afford (isopropylcarbamoylmethyl)carbamic acid benzyl ester as a white solid (24.5 g, 98 mmol, 98%) which was used without further purification in the next reaction. The mixture was filtered through a pad of CELITE™ concentrated in vacuo The crude residue was dissolved in ethyl acetate (500 mL) washed with 1N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL) The organic layer was dried (MgSO4) filtered concentrated in vacuo

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

Procedure: To a solution of N-Cbz-glycine (20.9 g, 100 mmol) in THF (400 mL) at 0° C. was added N-methylmorpholine (NMM) (12.1 mL, 110 mmol) and i-butylchloroformate (13 mL, 100 mmol). The resultant mixture was stirred at 0° C. for 2 min and then i-propylamine (9.4 mL, 110 mmol) was added. The reaction mixture was warmed to room temperature and stirred at this temperature for 16 h. The mixture was filtered through a pad of Celite and concentrated in vacuo. The crude residue was dissolved in ethyl acetate (500 mL) and washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL). The organic layer was dried (MgSO4), filtered and concentrated in vacuo to afford (isopropylcarbamoylmethyl)carbamic acid benzyl ester (24.5 g, 98 mmol, 98%) as a white solid which was used without further purification in the next reaction. The mixture was filtered through a pad of Celite concentrated in vacuo The crude residue was dissolved in ethyl acetate (500 mL) washed with 1 N HCl (aq.) (1×100 mL), sat. NaHCO3 (aq.) (1×100 mL) and brine (1×100 mL) The organic layer was dried (MgSO4) filtered concentrated in vacuo