反应详情

A mixture of methyl 3-bromo-5-(methylsulfonyl)benzoate (1.0 g, 3.4 mmol), 5-methyl-2-(tributylstannyl)pyridine (1.2 mL, 3.5 mmol), tetrakis(triphenylphosphine)palladium(0) (200 mg, 0.17 mmol), and toluene (10 mL) under argon was subjected to microwave irradiation at 120° C. for 2 hours. The mixture was cooled to room temperature. The precipitate was collected by filtration and rinsed with hexane to afford the title compound as a light brown solid (432 mg). The filtrate was concentrated and the residue was purified via flash chromatography to afford another crop of the product as a light yellow solid (200 mg). 1H NMR (400 MHz, CDCl3): 8.91 (t, J=1.4 Hz, 1H), 8.80 (d, J=1.7 Hz, 1H), 8.61 (s, 1H), 8.58 (d, J=0.8 Hz, 1H), 7.76 (d, J=8.1 Hz, 1H), 7.65 (d, J=8.1 Hz, 1H), 4.00 (s, 3H), 3.15 (s, 3H), 2.42 (s, 3H).

1. customirradiation at 120° C. for 2 hours
2. filtrationThe precipitate was collected by filtration
3. washrinsed with hexane