Triethylamine → tert-Butyl (6-bromo-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)acetate

Participants

Reaction Conditions

Reaction Steps

2-[(1-Amino-2-tert-butoxy-2-oxoethyl)amino]-4-bromobenzoic acid from Step C (2.72 g, 8.24 mmol), diphenylphosphoryl azide (2.1 mL, 9.9 mmol), and triethylamine (1.4 mL, 9.9 mmol) were dissolved in toluene (80 mL) and heated at 100° C. for 1 h. The cooled mixture was partitioned between EtOAc (200 mL) and water (100 mL). The organic layer was dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of hexane:EtOAc—100:0 to 0:100, to give the title compound. MS: m/z=327 (M+1).

Provenance & Evidence