Synthetic methods of naphthopyran compounds

The invention provides synthetic methods of naphthopyran compounds. According to the methods, 2-naphthol compounds and aryl terminal alkyne compounds are taken as the raw materials, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone is taken as an oxidizing agent and a BF3*Et2O solution is taken as a catalyst, and the naphthopyran compounds are synthesized. The method takes nonmetal lewis acid as the catalyst, transition metal catalysis is not needed, pre- functionalization of reaction raw materials is not needed, reaction conditions are mild, the yield is higher, and the method has broad industrial application prospects.