738 mg (1.00 mmol)) of 3-[(2S)-3-[4-[1-(benzyloxycarbonyl)-4-piperidyloxy]phenyl]-2-(4-iodobenzenesulfonylamino)propoxy]benzonitrile was dissolved in 5 ml of acetonitrile. 0.22 ml (2.0 mmol) of ethyl acrylate, 11 mg (0.05 mmol) of palladium acetate, 91 mg (0.3 mmol) of tris-o-tolylphosphine and 0.48 ml (2.0 mmol) of tributylamine were added to the solution, and they were heated under reflux for 15 hours. After the same isolation process as that of step 1 in Example 1 with dichloromethane as the extractant, the crude product was obtained, which was purified by the silica gel column chromatography to obtain the title compound.
