The present invention concerns a new process for the synthesis of aminaphtone, which makes use of non-toxic solvents and reagents, under mild reaction and temperature conditions. The aminaphtone obtained with the method of the present invention also has a purity of at least 98% in weight. The method comprises the following steps: a) epoxidating menadione 1 to provide epoxide 2, b) acidifying epoxide 2 to provide hydroxynaphthoquinone 3, c) esterifying between hydroxynaphthoquinone 3 and 4-aminobenzoyl chloride to obtain compound 4, and d) reducing compound 4 in the presence of a reducing agent in water to obtain aminaphtone.
本发明涉及一种合成
氨基
萘酮的新工艺,该工艺利用无毒溶剂和试剂,在温和的反应和温度条件下进行。本发明方法得到的
氨基
萘酮在重量上也具有至少98%的纯度。该方法包括以下步骤:a)环氧化
甲萘醌1以提供环氧化合物2,b)酸化环氧化合物2以提供羟基
萘醌3,c)在羟基
萘醌3和
4-氨基苯甲酰氯之间进行酯化以获得化合物4,d)在
水中存在还原剂的情况下还原化合物4以获得
氨基
萘酮。