Diphenyl Ether → 2-Bromo-6-methyl-3-[3-(methyloxy)phenyl]thieno[2,3-b]pyridin-4-amine

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Reaction Steps

Alternatively, 4-amino-2-bromo-6-methyl-3-[3-(methyloxy)-phenyl]thieno-[2,3-b]pyridine-5-carboxylic acid (856 mg, 2.177 mmol) (Description 16) in diphenyl ether (8 mL, 50.3 mmol) was heated at 200° C. for 4.5 h and stand at RT overnight for 16 h. The mixture was purified by chromatography on silica gel, eluting with a gradient of 0-100% ethyl acetate in cyclohexane, to give the title compound (471 mg).

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