Iodoethane → 1-ethyl-2-pyridin-3-yl-1H-indole-3-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(2-cyanomethyl-phenyl)-nicotinamide (Example 83a, 400 mg, 1.69 mmol) in DMF (17 mL) is added Cs2CO3 (1.1 g, 3.37 mmol). The reaction is heated to 80° C., at which time a solution of iodoethane (0.14 mL, 1.75 mmol) in DMF (5 mL) is added over 75 min. The temperature is then increased to 100° C. After stirring for an additional 2 h, the reaction is cooled to room temperature and quenched with saturated aqueous NH4Cl, and diluted with ethyl acetate and water. The layers are separated and the aqueous layer is extracted with ethyl acetate. The combined organic extracts are dried over sodium sulfate, filtered, and concentrated. The resulting residue is purified by silica gel flash chromatography (ethyl acetate-heptane, 3:10 to 1:0) to furnish 1-ethyl-2-pyridin-3-yl-1H-indole-3-carbonitrile. 1H NMR (400 MHz, CDCl3) δ ppm 1.40 (t, J=7.2 Hz, 3H), 4.22 (q, J=7.2 Hz, 2H), 7.32-7.45 (m, 2H), 7.47-7.51 (m, 1H), 7.54 (dd, J=7.8, 5.6 Hz, 1H), 7.82 (d, J=7.8 Hz, 1H), 7.91-7.98 (m, 1H), 8.78-8.85 (m, 2H). HRMS (ESI) m/z 248.1190 [(M+H)+ Calcd for C16H14N3: 248.1188].

Provenance & Evidence