Preparation method for alpha-amino acid

The invention provides a preparation method for an alpha-amino acid and belongs to the pharmaceutical technical field. The preparation method comprises the following steps: in the presence of an alkali, performing a reaction of a metal complex in an organic solvent to obtain a complex; and then hydrolyzing the complex and/or reacting with a protecting agent to obtain the alpha-amino acid or derivatives thereof. The method provided by the invention can simply obtain the amino acid or derivatives thereof without splitting the product, so that the yield is high, the cost is low, and industrial production is facilitated.