Method for preparing intermediate N-methoxycarbonyl methyl-N-ethyl-2-methoxy-5-acetamino aniline

A method for preparing an intermediate N-methoxycarbonyl methyl-N-ethyl-2-methoxy-5-acetamido aniline comprises the step of carrying out ethylation reaction on N-methoxycarbonyl methyl-2-methoxy-5-acetamido aniline by adopting halogenated ethane in the presence of alkali and a catalyst. The method is mild in condition, the yield of the intermediate N-methoxycarbonyl methyl-N-ethyl-2-methoxy-5-acetamino aniline is 92% or above, and the purity is 96% or above. 一种中间体N-甲氧碳酰甲基-N-乙基-2-甲氧基-5-乙酰氨基苯胺制备的方法，包括将N-甲氧碳酰甲基-2-甲氧基-5-乙酰氨基苯胺在碱、催化剂存在下采用卤代乙烷进行乙基化反应的步骤。该方法条件温和，并获得中间体N-甲氧碳酰甲基-N-乙基-2-甲氧基-5-乙酰氨基苯胺92％以上的收率及96％以上的纯度。