本文用2-氯-5-氯甲基吡啶经氨基化，和N-氰基乙亚胺酸乙酯反应，最后甲基化得到吡虫清。
In this thesis, 2-chloro-5-chloromethyl pyridine is ammoniated, which followed by the reaction with N-cyano ethyl ethylimidoate, finally is methylated to gain the objective product.
本文综述了2-氯-4-氨基吡啶的制备方法，并介绍了2-氯-4-氨基吡啶在调吡脲等杂环化合物合成方面的应用。
Several synthesis methods for the preparation of 2-chloro-4-aminopyridine were summarized in the article. The applications of 2-chloro-4-aminopyridine in heterocyclic synthesis were introduced.
本文综述了2-氯-4-氨基吡啶的制备方法，并介绍了2-氯-4-氨基吡啶在调吡脲等杂环化合物合成方面的应用。
Several synthesis methods for the preparation of 2-chloro-4-aminopyridine were summarized in the article. The applications of 2-chloro-4-aminopyridine in heterocyclic synthesis were introduced.
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