5-(Tert-butoxycarbonylamino-methyl)-2-nitro-benzoic acid → 2-Amino-5-({[(tert-butoxy)carbonyl]amino}methyl)benzoic acid

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Reaction Steps

A mixture of 5-(tert-butoxycarbonylamino-methyl)-2-nitro-benzoic acid (21.0 g, 70.9 mmol) in methanol (210 mL) and palladium/carbon (2 g) was hydrogenated with a Parr-shaker overnight at 51 psi. The black mixture was filtered through a pad of Celite, and the filtrate was evaporated to give a brown oil, which was stirred in ether (300 mL) overnight. The ether slurry was filtered to give 2-amino-5-(tert-butoxycarbonylamino-methyl)-benzoic acid as a brown solid (9.3 g, 49% yield). The product was used in the next step without further purification.

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