Synthesis method of diphenyl ether anthraquinone dye

The invention provides a synthesis method of diphenyl ether anthraquinone dye with a structure as shown in a formula A. According to the synthetic method, 1,5-dihydroxy-4,8-dinitro-9,10-anthracenedione is taken as a raw material, and a compound as shown in the formula A is obtained through the steps of bromination reaction, denitrification C-N coupling reaction, reduction reaction, nucleophilic reaction and the like. The method has the advantages of reasonable process design, easiness in purification, high yield, common and easily available reagents, mild reaction, low cost and easiness in industrial production. 本发明提供一种具有式A结构的二苯醚蒽醌类染料的合成方法，该合成方法以1,5-二羟基-4,8-二硝基-9,10-蒽二酮为原料，经过溴代反应、反硝化C-N偶联反应、还原反应、亲核反应等步骤得到式A的化合物。该方法工艺设计合理、易于提纯、收率高、试剂常见易得、反应温和，成本低、易于工业化生产。