反应详情

To a solution of 2.9 g of 2-amino-5-tert-butoxycarbonylamino-2-difluoromethylpentanoic acid in 10.5 ml of 1 M sodium hydroxide is added at 0° C. simultaneously 0.19 g of acetylchloride and 5 ml of 2 M 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.

1. extractionextracted with ethylacetate
2. customAfter usual work-up the solvent is evaporated
3. concentrationAfter concentration and purification by ion exchange chromatography on a resin 5-amino-2-acetylamino-2-difluoromethylpentanoic acid
4. customis obtained