Butanoic acid, 4-chloro-4-oxo-, ethyl ester → Ethyl 4-[(4-nitrobenzyl)amino]-4-oxobutanoate

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A mixture of 4-nitrobenzylamine hydrochloride (8.0 g), ethyl 4-chloro-4-oxobutanoate (10.47 g), saturated aqueous sodium hydrogen carbonate (100 ml) and ethyl acetate (100 ml) was stirred at room temperature for 2 hrs. The reaction mixture was extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous magnesium sulfate, and concentrated. Recrystallization of the residue from ethyl acetate-hexane gave ethyl 4-[(4-nitrobenzyl)amino]-4-oxobutanoate (10.3 g, 87%) as colorless prism crystals. melting point: 104-106° C.

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