反应详情

The starting 1-amino-4-bromoanthraquinone-2-carboxylic acid is reacted with 1.5 to 3 molar equivalents of a chlorinating agent such as thionyl chloride at a temperature of 80 to 100° C. for a period of about 1 to 3 hours in the presence of 0.01 to 5 molar equivalents (based on the raw material) of pyridine in 3 to 7-fold weight an amount of an inert solvent such as orthodichlorobenzene, chlorobenzene, toluene or xylene so as to be converted into an acid chloride. After the excess chlorinating agent has been removed therefrom under reduced pressure, 1.5 to 5 molar equivalents of isopropyl alcohol is added thereto and esterification is then performed at 60 to 80° C. for 1 to 3 hours. Afterward, the product is allowed to stand, thereby obtaining crystals of isopropyl 1-amino-4-bromoanthraquinone-2-carboxylate.

1. customAfter the excess chlorinating agent has been removed
2. additionunder reduced pressure, 1.5 to 5 molar equivalents of isopropyl alcohol is added