Acrylamide → 1-(2-carbamoylethyl)-5-(N-cyclopentylmethylcarbamoyl)indole

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A solution of 5-(N-cyclopentylmethylcarbamoyl)indole (A)(1.50 g) in N,N-dimethylformamide (DMF) (5 ml) was added to a stirred slurry of sodium hydride (0.16 g) in DMF (15 ml) maintained at 0° C. under an atmosphere of nitrogen. The mixture was warmed to room temperature for 15 minutes, treated with a solution of acrylamide (0.66 g) in DMF (5 ml), and allowed to stir for 12 hours. The mixture was poured into a cold, saturated aqueous solution of ammonium chloride to give a milky suspension which was extracted with ethyl acetate. The organic phase was washed successively with water and brine, dried (MgSO4), and evaporated. The resulting clear oil was purified by flash chromatography on silica gel (700 ml), eluting with 7:93 v/v methanol:ethyl acetate, to give 1-(2-carbamoylethyl)-5-(N-cyclopentylmethylcarbamoyl)indole (0.70 g, 36%) as a gummy white foam; NMR (80 MHz, CDCl3): 1.2-2.2(broad m, 9H, cyclopentyl), 2.7(t, 2H, CH2CO), 3.4 (dd, 2H, CH2NH), 4.5(t, 2H, CH2CH2CO), 5.4(broad, 2H, CONH2), 6.5(dd, 1H, H3 -indole), 7.2(d, 1H, H2 -indole), 7.3(d, 1H, H7 -indole), 7.6(dd, 1H, H6 -indole), 8.0(m, 1H, H4 -indole).

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