[OH:1][C:2]1[CH:3]=[C:4]([CH:10]=[CH:11][C:12]=1[O:13][CH3:14])[CH:5]=[CH:6][C:7](O)=[O:8].C(OC(=O)C(C)(C)C)(=O)C(C)(C)C.[H][H]>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C1(C)C=CC(P(C2C=CC(C)=CC=2)C2C=CC(C)=CC=2)=CC=1>[OH:1][C:2]1[CH:3]=[C:4]([CH:10]=[CH:11][C:12]=1[O:13][CH3:14])[CH:5]=[CH:6][CH:7]=[O:8]Palladium acetate (58 mg, 0.257 mmol), tri(p-tolyl) phosphine (157 mg, 0.515 mmol), 3-hydroxy-4-methoxycinnamic acid (5.00 g, 25.7 mmol) and pivalic acid anhydride (14.4 g, 77.2 mmol) were added thereto, and thereafter the mixture was bubbled with nitrogen gas for 30 minutes to substitute nitrogen gas completely for the gas in the system of reaction, whereby the system was filled with nitrogen gas. Next, hydrogen gas was added thereinto to substitute hydrogen gas for the gas in the system, and then the mixture was stirred under hydrogen pressure of 3.4 MPa at 80° C. for 24 hours for reaction. Thus obtained reaction solution was concentrated under reduced pressure to remove tetrahydrofuran by vaporization. The remaining residue was subjected to a purification process with a silica gel column chromatography (eluting solvent: toluene/ethyl acetate=4/1) to obtain 3-hydroxy-4-methoxycinnamaldehyde (2.26 g, 12.7 mmol, yield: 49%).
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