Dimethylformamide → (2E)-3-[4-(tert-Butyl)phenyl]-N-(1-methylindol-5-yl)prop-2-enamide

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Reaction Steps

1-Methylindole-5-ylamine. To a round-bottomed flask was added 5-nitroindole (0.81 g, 5.0 mmol, Aldrich) and anhydrous DMF (40 mL). The solution was stirred magnetically and treated with sodium hydride (0.40 g, 10 mmol, 60% dispersion in mineral oil, Aldrich) followed by iodomethane (0.71 gm 10 mmol, Aldrich). Stirring was continued at 25° C. for 30 min, then the reaction mixture was quenched by the addition of water (75 mL) and extracted with EtOAc. The organic extract was concentrated in vacuo to provide a crude residue. Analogous to the procedure of Goswami, P.; Chowdhury, P.; Indian J Chem, Sect B, 1997, 36 (2), 185-186, the crude residue was dissolved in THF (40 mL) and added to Zn dust (0.22 g, 3.3 mmol, Aldrich) and AlCl3.6H2O (4.78 g, 19.8 mmol, Aldrich) in water (1 mL), magnetically stirred at 25° C. The reaction mixture was stirred at 25° C. for 16 h, then filtered. The filtrate was added to cold water (300 mL) and extracted with CH2Cl2 (3×100 mL). The combined organic extract was concentrated in vacuo to provide the title product. MS (ESI, pos. ion) m/z: 147 (M+1).

Provenance & Evidence