2,4-Dichlorobenzenethiol → 7-[(2,4-Dichlorophenyl)thio]thieno[3,2-b]pyridine-6-carbonitrile

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Reaction Steps

A mixture of 7-chlorothieno[3,2-b]pyridine-6-carbonitrile (200 mg, 1.03 mmol) and 2,4-dichlorothiophenol (202.9 mg, 1.13 mmol) in 5 mL of N,N-dimethylformamide is stirred at room temperature for 1 hour, and then concentrated in vacuo. The resulting residue is treated with water and stirred for 1 hour. The precipitate is filtered, washed with water, air dried, and then purified by flash column chromatography eluting with a gradient of 5% ethyl acetate in hexane to 20% ethyl acetate in hexane to provide 249.0 mg of 7-[(2,4-dichlorophenyl)thio]thieno[3,2-b]pyridine-6-carbonitrile as a white solid, mp 126–128° C.; 1H NMR (DMSO-d6) δ 7.47 (dd, J=6,2 Hz, 1H), 7.54 (d, J=6 Hz, 1H), 7.73 (d, J=4 Hz, 1H), 7.88 (d, J=2 Hz, 1 H), 8.43 (d, J=4 Hz, 1H), 9.09 (s, 1H); MS 336.9, 339.0 (M+H)+.

Provenance & Evidence