Sodium hydride → 7-[(2,4-Dichloro-5-methoxyphenyl)amino]-2-methylthieno[3,2-b]pyridine-6-carbonitrile

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Reaction Steps

A mixture of 2,4-dichloro-5-methoxyaniline (507 mg, 2.64 mmol) and 60% sodium hydride (105.6 mg, 2.64 mmol) in 15 mL of tetrahydrofuran is heated at reflux for 1 hour. The solution is cooled and 7-chloro-2-methylthieno[3,2-b]pyridine-6-carbonitrile (275.3 mg, 1.32 mmol) is added. The reaction mixture is heated at reflux for 6 hours, cooled to room temperature and partitioned between dichloromethane and water. The organic layer is washed with saturated aqueous sodium chloride, dried over sodium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with a gradient of 5% ethyl acetate in hexane to 20% ethyl acetate in hexane followed by preparative thin layer chromatography developing with 20% ethyl acetate in dichloromethane, to provide 108 mg of 7-[(2,4-dichloro-5-methoxyphenyl)amino]-2-methylthieno[3,2-b]pyridine-6-carbonitrile as an off white solid, mp 213–214° C.; 1H NMR (DMSO-d6) δ 2.51 (s, 3H), 3.85 (s, 3H), 7.20 (s, 1H), 7.35 (s, 1H), 7.75 (s, 1H), 8.55 (s, 1H), 9.56 (s, 1H); MS 362.1, 364.3 (M+H)+.

Provenance & Evidence