Edaravone, a free radical scavenger, was synthesized by condensation of ethyl acetoacetate withphenylhydrazine in presence of NaHSO3 in water at pH 6 for 2h in a yield of 83%.

• 用苯肼和乙酰乙酸乙酯在亚硫酸氢钠参与下于水中回流反应2h制得自由基清除剂依达拉奉,收率83%25。方法操作简单,成本低。