3-Ethynylpyridine → 4-[(2,4-Dichloro-5-methoxyphenyl)amino]-2-(pyridin-3-ylethynyl)thieno[2,3-b]pyridine-5-carbonitrile

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Reaction Steps

A mixture of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-2-iodothieno[2,3-b]pyridine-5-carbonitrile (220 mg, 0.50 mmol), 3-ethynylpyridine (72 mg, 0.7 mmol), 20 mg of tetrakis(triphenylphosphine)palladium(0) and copper iodide (6 mg, 0.22 mmol) in 7 mL of benzene and 2 mL of triethylamine is heated at reflux for 5 hours. The reaction mixture is cooled to room temperature and a solid appears. The solid is triturated with hot ethyl acetate, filtered, washed with hexanes and dried under vacuum to provide 100 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-2-(pyridin-3-ylethynyl)thieno[2,3-b]pyridine-5-carbonitrile as a tan solid, mp 191° C. (decomposition); 1H NMR (DMSO-d6+TFA) δ 3.88 (s, 3H), 7.37 (s, 1H), 7.43 (s, 1H), 7.78 (s, 1H), 7.85 (bs, 1H), 8.16 (s, 1H), 8.39 (bs, 1H), 8.54 (s, 1H), 10.02 (bs, 1H); MS 451.0 (M+H)+.

Provenance & Evidence