[CH:1]([C:3]1[NH:4][C:5]2[C:10]([C:11]=1[C:12]([O:14][CH3:15])=[O:13])=[CH:9][CH:8]=[CH:7][CH:6]=2)=[CH2:2]>[Pd].CO>[CH2:1]([C:3]1[NH:4][C:5]2[C:10]([C:11]=1[C:12]([O:14][CH3:15])=[O:13])=[CH:9][CH:8]=[CH:7][CH:6]=2)[CH3:2]Methyl 2-vinyl-1H-indole-3-carboxylate (80 mg, 0.4 mmol) and 10% palladium on charcoal (100 mg) in methanol (30 mL) were stirred under hydrogen 0.2 MPa at room temperature for 15 hours. The mixture was filterated the solid and concentrated in vacuum to obtain methyl 2-ethyl-1H-indole-3-carboxylate as a white solid (79 mg, 99%) LRMS (M+H+) m/z: calcd 203.1 found 203.
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