A compound produced by the process comprising the step of reacting a starting compound of the formula:
with FeCl3 in the presence of acetic acid, wherein the reaction mixture is heated and the temperature of the reaction mixture is about 85° C.to about reflux temperature, R1 and R2 in the above formula being as defined in the present specification.
一种化合物的制备方法,包括以下步骤:将式子中的起始化合物与
醋酸存在下,在FeCl3存在下反应,反应混合物加热,反应混合物的温度约为85°C至沸点温度之间,其中上述式子中的R1和R2在本说明书中定义。