[C:1]([C:5]1[CH:10]=[CH:9][C:8]([CH:11]=[C:12]([CH3:16])[C:13]([OH:15])=[O:14])=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2]>[Pd].CO>[C:1]([C:5]1[CH:10]=[CH:9][C:8]([CH2:11][CH:12]([CH3:16])[C:13]([OH:15])=[O:14])=[CH:7][CH:6]=1)([CH3:4])([CH3:2])[CH3:3]3-(4-tert-butylphenyl)-2-methylacrylic acid (40.9 mg, 0.19 mmol) and 10 wt. % palladium on activated carbon were added in methanol. The reaction mixture was stirred for 5 hrs under H2 gas. The reaction mixture was filtered with Celite. The filterate was concentrated in vacuo to obtain title compound (39.1 mg, 93.47%).
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