CN(C)[CH:3]=[CH:4][C:5]1[C:10]([C:11](=[O:20])[C:12]2[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=2)=[CH:9][CH:8]=[CH:7][C:6]=1[N+:21]([O-])=O.[H][H]>C(OCC)(=O)C.[Pd]>[CH3:19][O:18][C:15]1[CH:14]=[CH:13][C:12]([C:11]([C:10]2[CH:9]=[CH:8][CH:7]=[C:6]3[C:5]=2[CH:4]=[CH:3][NH:21]3)=[O:20])=[CH:17][CH:16]=1A solution of 32 g. (0.098 mole) of 2-(2-dimethylaminoethenyl)-3-(4-methoxybenzoyl)nitrobenzene in 200 ml of ethyl acetate was treated with 5 g of 10% palladium-on-charcoal, and the starting material reduced with hydrogen under 50 p.s.i.g. The mixture was then filtered, the filtrate taken to dryness, and the residue recrystallized from ethyl acetate to give 18.1 g of 4-(4-methoxybenzoyl)indole. Another sample, similarly prepared by reduction of the starting material with Raney nickel in ethanol, afforded material having m.p. 148°-152° C.
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