Anhydrous aluminum trichloride (1.33 g, 9.8 mmol), oxalyl chloride (0.43 mL，4.9 mmol) and triphenylamine (2.94 g 12 mmol) were dissolved in anhydrous CH2Cl2 (10 mL) and refluxed at 40 o C for 2 h. After cooled down to room temperature and poured into ice water. Hydrochloric acid (10 mL, 37%) was added and the mixture was extracted with CH2Cl2 (30 mL × 2). The combined organic layers were washed with water (30 mL × 3) and dried over anhydrous Na2SO4. After removing the solvent, the residue was purified using column chromatography on silica gel employing CH2Cl2/PE (1/1) as an eluent to afford a yellow solid with a yield of 28%. 1 (500 mg, 0.92 mmol) and 1,2-diaminoanthraquinone (220 mg, 0.912 mmol) was dissolved in AcOH (15 mL) and heated to 120 °C and stirred for 12 h. After cooled down to room temperature and then poured into 30 mL water and extracted with CH2Cl2 (20 mL × 3). The resultant organic phase was washed with brine, and dried over anhydrous Na2SO4. After removing the solvent, the residue was purified using column chromatography on silica gel employing CH2Cl2/PE (1/1) as an eluent to give a red solid with a yield of 37%.