Preparation method of naphtho[1,8-de][1,3]thiazin-2-mercaptan

The invention relates to a preparation method of naphtho[1,8-de][1,3]thiazin-2-mercaptan, and belongs to the field of organic synthesis. The preparation method comprises the steps that: 1,8-dinaphthylamine serves as a starting raw material and reacts with sodium nitrite under the acidic condition, and then 8-halogenated-1-aminonaphthalene (1) is generated under the action of copper powder; 8-halogenated-1-aminonaphthalene (1) serving as a reaction raw material and copper (I) salt serving as a catalyst react with carbon disulfide, concentration, separation and purification are carried out to obtain naphtho[1,8-de][1,3]thiazin-2-mercaptan. The method has the advantages that naphtho[1,8-de][1,3]thiazin-2-mercaptan can be obtained only through two-step reaction, and the method is mild in condition, simple to operate, high in yield and the like. 本发明涉及一种萘并[1,8-de][1,3]噻嗪-2-硫醇的制备方法，属于有机合成领域，本发明以1,8-二萘胺为起始原料，在酸性条件下，与亚硝酸钠反应，然后在铜粉作用下生成8-卤代-1-氨基萘(1)。在氮气保护下，以8-卤代-1-氨基萘(1)为反应原料，铜(I)盐为催化剂，与二硫化碳反应，经浓缩和分离纯化，可得到萘[1,8-de][1,3]