Acetyl chloride → (S)-3-(4-Acetylamino-2-benzyloxy-benzenesulfonylamino)-succinamic acid tert-butyl ester

Participants

Reaction Steps

To a solution of (S)-3-(4-amino-2-benzyloxy-benzenesulfonylamino)-succinamic acid tert-butyl ester (1.41 g, 3.10 mmol) in methylene chloride (100 mL) and Et3N (0.44 mL, 3.10 mmol) was added acetyl chloride (0.25 mL, 3.1 mmol). The reaction was stirred for 3 h. The solvent was removed and replaced with EtOAc (150 mL). The organic solution was washed twice with 5% citric acid, saturated NaHCO3, water, and brine. The solution was dried over MgSO4, filtered, and the solvent was removed. The resulting crude product was purified using silica gel flash chromatography (20% hexanes in EtOAc). (S)-3-(4-Acetylamino-2-benzyloxy-benzenesulfonylamino)-succinamic acid tert-butyl ester was obtained in 63% yield (0.96 g) as an off white foam. MS (APCI) m/z 490.2 (M−1).

Provenance & Evidence