Sodium Hydroxide → HCID 67411497, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the previous di_Boc protected benzylamine (290 g, 0.652 mol, 1.0 eq) in DCM (2.9 L) was added TFA (92.8 g, 0.813 mol, 1.25 eq) dropwise at 0° C., the resulting mixture was stirred at room temperature for 4 hrs. 0.5 M NaHCO3 was added to the mixture to adjust pH to 8. The reaction mixture was washed with water (3*500 ml), dried over MgSO4 and concentrated by rotavapor to give 3-bromo-4-(tert-butoxycarbonylamino-methyl)-benzoic acid methyl ester (210 g, 93.5% yield) as yellow oil. NaOH (48.8 g, 1.22 mol, 2.0 eq) in H2O (1.26 L) was added to a solution of 3-bromo-4-(tert-butoxycarbonylamino-methyl)-benzoic acid methyl ester (210 g, 0.61 mol, 1.0 eq) in MeOH (1.26 L). The reaction mixture was stirred at 50° C. for 2 hrs. The reaction was cooled to room temperature and concentrated to half volume. The residue was acidified to pH 5 by adding 1M HCl solution. The resulting solid was collected and dried to give the title intermediate (200 g, 99.4% yield) as white solid.

Provenance & Evidence