An indigo compound is prepared by reacting a corresponding indole compound having no substituent at the 2- and 3-positions with a percarboxylic acid in an alcohol solvent, or by heating to above 60°C in an aprotic solvent.
靛蓝化合物的制备方法是:将 2-位和 3-位没有取代基的相应
吲哚化合物与过
羧酸在
醇类溶剂中反应,或在无相溶剂中加热至 60°C 以上。