In a similar manner to Step 2 of Example 161, 4-chloro-7-[1-(tert-butoxycarbonyl)-3-iodoindol-2-yl]isoindolinone (148 mg, 0.291 mmol) was dissolved in diethylamine (7.4 mL), and the Solution was treated with bis(triphenylphosphine)dichloropalladium (16.3 mg, 0.0233 mmol), copper iodide (11.1 mg, 0.0582 mmol) and 3-butyn-1-ol (0.220 mL, 2.91 mmol), followed by purification by preparative thin-layer chromatography (chloroform/methanol=10/1) to obtain 4-chloro-7-[1-(tert-butoxycarbonyl)-3-(4-hydroxy-1-butynyl)indol-2-yl]isoindolinone (114 mg, yield 87%).
