Method for synthesizing UV-627 key intermediate based on photocatalysis strategy

The invention provides a method for synthesizing a key intermediate of an ultraviolet light absorber UV-627 based on a photocatalysis strategy, which comprises the following steps: directly carrying out an arylation reaction on cyanuric chloride and anisole in air at room temperature by adopting a specific photocatalyst to obtain a 2, 4-dichloro-6-(4-methoxyphenyl)-1, 3, 5-triazine solution, and carrying out a reaction on the 2, 4-dichloro-6-(4-methoxyphenyl)-1, 3, 5-triazine solution to obtain the key intermediate of the ultraviolet light absorber UV-627 based on the 2, 4-dichloro-6-(4-methoxyphenyl)-1, 3, 5-triazine. And then adding resorcinol and alkali for reaction, filtering, concentrating filtrate under reduced pressure, adding a saturated ammonium chloride aqueous solution, precipitating a solid, filtering, washing a filter cake with water, and drying to obtain the 2, 6-(2, 4-dihydroxyphenyl)-4-(4-methoxyphenyl)-[1, 3, 5] triazine. The method is easy to operate, environmentally friendly, low in raw mat