Cl[C:2]1[C:7]([C:8]#[N:9])=[CH:6][N:5]=[C:4]2[CH:10]=[CH:11][S:12][C:3]=12.C(=O)([O-])[O-].[K+].[K+].[Cl:19][C:20]1[CH:25]=[C:24]([Cl:26])[CH:23]=[CH:22][C:21]=1[OH:27].O>CN(C)C=O>[Cl:19][C:20]1[CH:25]=[C:24]([Cl:26])[CH:23]=[CH:22][C:21]=1[O:27][C:2]1[C:7]([C:8]#[N:9])=[CH:6][N:5]=[C:4]2[CH:10]=[CH:11][S:12][C:3]=12
A mixture of 7-chlorothieno[3,2-b]pyridine-6-carbonitrile (200 mg, 1.03 mmol), potassium carbonate (194.9 mg, 1.41 mmol) and 2,4-dichlorophenol (218.3 mg, 1.34 mmol) in 3 mL of N,N-dimethylformamide is stirred at 110° C. for 4 hours and allowed to cool to ambient temperature. The reaction mixture is treated with water and stirred at ambient temperature for 10 minutes. The crude solid is collected by filtration washing with water, dried in vacuo, then purified by flash column chromatography eluting with a gradient of 5% ethyl acetate in hexane to 20% ethyl acetate in hexane to provide 244 mg of 7-[(2,4-dichlorophenoxy)]thieno[3,2-b]pyridine-6-carbonitrile as a white solid, mp 158-160° C.; 1H NMR (DMSO-d6) δ 7.63 (dd, J=6, 2 Hz, 1H), 7.68 (d, J=4 Hz, 1H), 7.74 (d, J=6 Hz, 1H), 7.80 (d, J=2 Hz, 1H), 8.33 (d, J=4 Hz, 1H), 9.03 (s, 1H); MS 320.9, 322.9 (M+H)+.
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