Potassium Carbonate → (S)-3-bromo-7-(5-fluoropyridin-3-yl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-thiazol]-2'-amine

関与物質

反応条件

反応手順

A vial was charged with (S)-3-bromo-7-iodo-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazol]-2′-amine (300 mg, 0.63 mmol, prepared as described in Method BB26), potassium carbonate (437 mg, 3.16 mmol), 5-fluoropyridin-3-ylboronic acid (178 mg, 1.27 mmol), tetrakis(triphenylphosphine)palladium(0) (73.1 mg, 0.063 mmol), dioxane (4.22 mL) and water (2.12 mL). The reaction was stirred and heated at 100° C. for 1 h. After cooling for rt, the organic layer was separated with a separatory funnel, dried over sodium sulfate, filtered, and concentrated to afford a yellow oil which was purified by silica gel chromatography (Redi-Sep pre-packed silica gel column (24 g), 0-50% EtOAc in hexanes to provide a white solid, (S)-3-bromo-7-(5-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-thiazol]-2′-amine (130 mg, 0.29 mmol, 46%). MS m/z=443.0 [M+H]+. Calc'd for C19H12BrFN4OS: 441.99.

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