Formaldehyde → (2E)-3-[4-(tert-Butyl)phenyl]-N-(1-methylindolin-6-yl)prop-2-enamide

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1-Methylindoline-6-ylamine. To a round-bottomed flask was added 6-nitroindoline (1.64 g, 10.0 mmol, Aldrich), 37% aq. formaldehyde (2.35 g, 30.0 mmol, Aldrich) and THF (40 mL). The reaction mixture was magnetically stirred at 25° C. and treated with sodium cyanoborohydride (1.89 g, 30.0 mmol, Aldrich). The reaction mixture was allowed to stir at 25° C. for 30 min, then washed with satd Na2CO3. The aqueous phase was extracted with ethyl ether, the organic phases combined and concentrated in vacuo to a 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 tetrahydrofuran (60 mL) and added to Zn dust (0.43 g, 6.6 mmol, Aldrich) and AlCl3.6H2O (9.6 g, 40 mmol, Aldrich) in water (2 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 as a brown solid. MS (ESI, pos. ion) m/z: 149 (M+1).

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