Method for synthesizing D-valine

The present invention discloses a method of synthesizing D- valine. Isobutyraldehyde as a starting material, 2-amino-3-methyl-butyronitrile was prepared by cyanidation; then using an inorganic base and a ketone catalyzed hydrolysis of mixed spin of the free base (±) -2- amino-3- butanamide; L-DBTA with a resolving agent, in a mixed solvent of acetone and water splitting, to give an optically active D-2- amino-3-methylbutanamide L-DBTA salt solid; split and then isolated by acidification divided doses, hydrolysis at reflux to give D-2- purified amino-3-methylbutanoic acid, i.e., D- valine. The method of the present invention is readily available and inexpensive raw materials, simple operation, low cost, and less environmental pollution, and suitable for industrial production.