In a similar manner to Example 2, crude 3-{2-[5-(4-methylpiperazin-1-yl)-2-nitrophenyl]vinyl}-1H-indazole (262 mg, 0.72 mmol) obtained in Step 1 was dissolved in ethanol (10 mL) and was reacted with tin (0.26 g, 2.2 mmol) and concentrated hydrochloric acid (1.3 mL) at room temperature to obtain 2-[2-(1H-indazol-3-yl)vinyl]-4-(4-methylpiperazine-1-yl)phenylamine. In a similar manner to Example 29, 2-[2-(1H-indazol-3-yl)vinyl]-4-(4-methylpiperazin-1-yl)phenylamine (0.10 g, 0.30 mmol) was dissolved in THF (5.0 mL) and the solution was added with triethylamine (0.13 ml, 0.90 mmol) and 3-methylthiophenecarbonyl chloride (0.05 g, 0.31 mmol), followed by stirring at room temperature for 1 hour. The reaction mixture was added with saturated aqueous sodium hydrogencarbonate solution and extracted with ethyl acetate. The organic layer was concentrated under reduced pressure and the obtained crude product was triturated in ethyl acetate to obtain Compound 228 (0.10 g, 73%).
