反应详情

温度

90 °C

A 48 mL tube was charged with 5-bromo-2-fluoropyridine (1.17 ml, 11.4 mmol), 3-methyl-5-(tributylstannyl)isoxazole (5.29 g, 14.2 mmol), cyclohexyl JohnPhos (0.398 g, 1.14 mmol), Pd2dba3 (0.312 g, 0.341 mmol), and DMF (12.4 ml, 159 mmol), flushed with argon, sealed, then heated at 90° C. for 16 hours. Additional 3-methyl-5-(tributylstannyl)isoxazole (5.29 g, 14.2 mmol) (2 g), Pd2 dba3 (0.312 g, 0.341 mmol), and cyclohexyl JohnPhos (0.398 g, 1.14 mmol) were added and the mixture was stirred at 90° C. for 10 more hours. This was concentrated and the brown residue was purified by MPLC, eluting with 15% ethyl acetate in hexanes isocratic. 2-fluoro-5-(3-methylisoxazol-5-yl)pyridine (1.1029 g, 54.5% yield) isolated as a light yellow solid.

1. customflushed with argon
2. customsealed
3. concentrationThis was concentrated
4. customthe brown residue was purified by MPLC
5. washeluting with 15% ethyl acetate in hexanes isocratic