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

Participants

Reaction Steps

A mixture of 2,4-dichloro-5-methoxyaniline (0.15 g, 0.73 mmol) and 60% sodium hydride (50 mg, 1.25 mmol) in 15 mL of tetrahydrofuran is heated at reflux for 1 hour. The solution is cooled and 4-chloro-2-methylthieno[2,3-b]pyridine-5-carbonitrile (0.06 g, 0.29 mmol) is added. The reaction mixture is heated at reflux for 3 hours then allowed to stir at room temperature overnight. The resultant black solution is partitioned between ethyl acetate and water. The organic layer is washed with water, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue is purified by flash column chromatography eluting with 3:7 ethyl acetate:hexane. The fractions containing product are combined and concentrated. Diethyl ether is added and the insoluble material collected by filtration to provide 79 mg of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-2-methylthieno[2,3-b]pyridine-5-carbonitrile as a tan solid, mp 179–181° C.; 1H NMR (DMSO-d6) δ 2.57 (s, 3H), 3.85 (s, 3H), 7.32 (s, 1H), 7.39 (s, 1H), 7.74 (s, 1H), 8.35 (s, 1H), 9.61 (s, 1H); MS 362.1 (M−H)−

Provenance & Evidence