2-(4-Nitrophenoxy)-propionic acid 2-[2-(4-nitrophenoxy)-acetoxy]-ethyl ester → 2-(4-Aminophenoxy)propionic acid-2-[2-(4-aminophenoxy)acetoxy]ethyl ester

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2-(4-Nitrophenoxy)propionic acid 2-[2-(4-nitrophenoxy)acetoxy]-ethyl ester 38 (20 g, 50 mmol) was dissolved in dry dimethylformamide (150 ml) in a pressure vessel. Palladium on carbon (5%, 5 g) was added and the mixture stirred under an atmosphere of hydrogen (4 kg) for 3 hrs. The catalyst was removed by filtration and ice water (1L) added to the filtrate. Crude 39 was extracted into ethyl acetate, dried over Na2SO4, distilled and purified by column chromatography on silica gel using chloroform:ethyl acetate (8:2) to give pure 39 (10 g, 58%) as a dark brown syrup.

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