Potassium Carbonate → HCID 22256611, compound

Participants

Reaction Steps

A mixture of 7-[(2,4-dichloro-5-methoxyphenyl)amino]-2-[(trimethylsilyl)ethynyl]thieno[3,2-b]pyridine-6-carbonitrile (365 mg, 0.82 mmol), 4-iodopyridine (252 mg, 1.23 mmol), potassium carbonate (565 mg, 4.09 mmol), 30 mg of bis(triphenylphosphine)palladium(II) chloride, 43 mg of triphenylphosphine and 8 mg of copper(I) iodide in 10 mL of tetrahydrofuran and 2 mL of methanol is heated at reflux overnight. The mixture is cooled to room temperature and 50 mL of chloroform are added. The mixture is washed with water and saturated aqueous sodium chloride, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue is purified by two flash column chromatographies, first eluting with 5% methanol in dichloromethane and then eluting with 1:1 ethyl acetate:hexane to provide 174 mg of 7-[(2,4-dichloro-5-methoxyphenyl)amino]-2-(pyridin-4-ylethynyl)thieno[3,2-b]pyridine-6-carbonitrile as orange crystals, mp 221–223° C.; 1H NMR (CDCl3) δ 3.86 (s, 3H), 7.43 (s, 1H), 7.59 (d, J=5 Hz, 2H), 7.81 (s, 1H), 7.89 (s, 1H), 8.61–8.71 (m, 3H), 9.89 (s, 1H); MS 451.2 (M−H)+.

Provenance & Evidence