Hydrochloric Acid → 2-Acetylamino-5-amino-2-difluoromethylpentanoic acid

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Reaction Steps

To a solution of 2.9 g of 2-amino-5-tert-butoxycarbonylamino-2-difluoromethylpentanoic acid in 10.5 ml of 1M sodium hydroxide is added at 0° C. simultaneously 0.19 g of acetylchloride and 5 ml of 2M aqueous sodium hydroxide. The reaction mixture is stirred for 3 hours at room temperature. The alkaline aqueous solution is then adjusted to a pH of 2 with hydrochloric acid and extracted with ethylacetate. After usual work-up the solvent is evaporated and the residue taken up in trifluoroacetic acid. After concentration and purification by ion exchange chromatography on a resin 5-amino-2-acetylamino-2-difluoromethylpentanoic acid is obtained.

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