反应详情

温度

110 °C

A suspension of 2-bromo-4,6-dimethylpyridine (2.42 g, 13 mmol), 3-vinyl-6-nitro-1-(tetrahydro -pyran-2-yl)-1H-indazole (2.37 g, 8.67 mmol), palladium acetate (0.145 g, 0.65 mmol), tri-ortho-tolylphosphine (0.791 g, 2.6 mmol), and diisopropylethylamine (2.4 mL, 13.8 mmol) in aqueous DMF (85%, 34.5 mL) was degassed with Argon bubbling for 5 minutes followed by sonication for 5 minutes before heating in microwave apparatus (300 watts, 10% power) at 110° C. for 40 minutes. After cooling, the mixture was dropped into cold water. The resulting yellow ppt was collected by filtration. The solids were dissolved in ethyl acetate, dried (sodium sulfate), and concentrated under reduced pressure. The residue was purified on silica gel using a gradient of 0 to 20% ethyl acetate in a mixture of chloroform and hexanes (1:1) as eluent. Product from chromatography was triturated with MTBElhexanes to obtain clean product as yellow solid. Mother liquor was repurified in a similar fashion on silica gel followed by trituration to obtain product in a 68% yield. 1H NMR (CDCl3): δ 8.54 (1H, s), 8.15 (1H, d, J=9.4 Hz), 8.08 (1H, dd, J=9.04,1.9 Hz), 7.87 (1H, d, J=16.6 Hz), 7.55 (1H, d, J=16.6 Hz), 7.14 (1H, s), 6.90 (1H, s), 5.82 (1H, dd, J=9.0, 3.0 Hz), 4.08–4.01 (1H, m), 3.84–3.76 (1H, m), 2.56 (3H, s), 2.62–2.54 (1H, m), 2.34 (3H, s), 2.24–2.10 (2H, m), 1.88–1.68 (3H, m).

1. customwas degassed with Argon bubbling for 5 minutes
2. customfollowed by sonication for 5 minutes
3. temperatureAfter cooling
4. additionthe mixture was dropped into cold water
5. filtrationThe resulting yellow ppt was collected by filtration
6. dissolutionThe solids were dissolved in ethyl acetate
7. dry with materialdried (sodium sulfate)
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified on silica gel using a gradient of 0 to 20% ethyl acetate
10. additionin a mixture of chloroform and hexanes (1:1) as eluent
11. customProduct from chromatography was triturated with MTBElhexanes
12. customto obtain clean product as yellow solid
13. customMother liquor was repurified in a similar fashion on silica gel
14. customto obtain product in a 68% yield