[CH3:1][O:2][CH2:3][CH2:4]/[CH:5]=[CH:6]/[C:7]1[N:11]2[CH:12]=[CH:13][CH:14]=[CH:15][C:10]2=[N:9][C:8]=1[C:16]([O:18][CH2:19][CH3:20])=[O:17].C1(SC2C=CC=CC=2)C=CC=CC=1.[H][H]>C(OCC)(=O)C.[C].[Pd]>[CH3:1][O:2][CH2:3][CH2:4][CH2:5][CH2:6][C:7]1[N:11]2[CH:12]=[CH:13][CH:14]=[CH:15][C:10]2=[N:9][C:8]=1[C:16]([O:18][CH2:19][CH3:20])=[O:17]Ethyl 3-[(1E)-4-methoxybut-1-en-1-yl]imidazo[1,2-a]pyridine-2-carboxylate (530 mg) and diphenyl sulfide (3.6 mg) were dissolved in ethyl acetate (13 ml), 10% palladium carbon (50% in water) (53 mg) was added and the mixture was stirred in a hydrogen stream at ambient temperature and normal pressure for 2.5 hr. The catalyst was filtered off, and the filtrate was concentrated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate was concentrated under reduced pressure to give the object product (260 mg).
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