Chemical synthesis method for 3-methylquinoxaline-2-carboxylic acid

The invention discloses a synthesizing method of 3-methyl quinoxaline-2-carboxyl acid, which comprises the following steps: adopting 2-[(N-2-hydroxyethyl) amino formyl]-3-methyl quinoxaline-1, 4-dioxide (quinoxalcohol) as raw material; reducing through potassium iodide or sodium hydrosulfite; hydrolyzing product through alkaline; adjusting pH value through acid; obtaining the product with high receiving rate and low cost.