Ethyl bromoacetate → HCID 53955006, compound

Participants

Reaction Steps

A cold (0° C.) solution of N-phenylsulphonyl-4-nitroaniline (7.39 g, 30 mmol) in DMF (65 mL) was treated with sodium hydride (0.76 g, 32 mmol) portionwise over a period of 1.5 h. A solution of ethyl bromoacetate (4 mL) in DMF (10 mL) was added, and the resultant mixture stirred at RT overnight. The product mixture was concentrated under vacuum, and the residue dissolved in ethyl acetate. The organic extract was washed with brine, dried over magnesium sulfate, filtered and concentrated under vacuum. The residue was subjected to column chromatography on silica gel eluting with 0.5% methanol in chloroform. Collection and concentration of appropriate fractions provided N-4-nitrophenyl-N-phenylsulfonylglycine ethyl ester (4-8a) as a clear gum. ##STR41## Step 2: N-{4-[4-(4-tert-Butyloxycarbonylpiperazin-1-yl)phenylcarbonyl-amino]phenyl}-N-phenylsulfonylglycine ethyl ester (4-10a)

Provenance & Evidence