Dimethylformamide → 1-ethyl-2-(4-fluorophenylethynyl)-6-methoxy-1H-indole-3-carbonitrile

Participants

Reaction Steps

A mixture of 1-ethyl-2-iodo-6-methoxy-1H-indole-3-carbonitrile (150 mg, 0.46 mmol), prepared as described in example 1Ga, step A, 4-fluorophenylacetylene (80 mg, 0.0.69 mmol), bis(triphenylphosphine) palladium (II) dichloride (6 mg, 0.009 mmol) and CuI (4 mg, 0.018 mmol) was added to a sealable tube and alternatively evacuated and flushed with N2. To the tube was then added DMF (4 mL) and Et3N (0.25 mL, 1.84 mmol) and the reaction was heated at 80° C. for 20 h and then cooled to room temperature. The reaction mixture was diluted with H2O and extracted with EtOAc (2×). The combined organic phases were washed with H2O (3×) and saturated NaCl and then dried over MgSO4 and concentrated. The crude reaction mix was absorbed on silica gel (0.6 g) and chromatographed over silica gel using EtOAc/hexanes (10-20%) as eluent to afford 120 mg (82%) of 1-ethyl-2-(4-fluorophenylethynyl)-6-methoxy-1H-indole-3-carbonitrile as a yellow solid.

Provenance & Evidence