Hydrochloric Acid → {1-[2-(4'-Bromo-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

2-(4′-Bromo-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (496 mg, 1.11 mmol) was dissolved in methanol and concentrated HCl (2 mL) was added. The solution was stirred at 60° C. for 30 min then concentrated. The resulting residue was treated with 2-methoxycarbonylamino-3-methyl-butyric acid (233 mg, 1.33 mmol), HATU (549 mg, 1.44 mmol) and DMF (10 mL). After cooling this mixture to 0° C., DIPEA (0.970 mL, 5.55 mmol) was added. The reaction mixture was Stirred for 5 hours then diluted with ethyl acetate (150 mL) and washed with water and brine. The organic phase was dried over magnesium sulfate and concentrated. The resulting residue was purified by silica column chromatography (70% to 90% EtOAc/hexanes) to afford {1-[2-(4′-Bromo-biphenyl-4-ylcarbamoyl)-pyrrolidine-1-carbonyl]-2-methyl-propyl}-carbamic acid methyl ester (520 mg, 93% over 2 steps).

Provenance & Evidence