反应详情

In a 100 mL round bottomed flask under nitrogen, ethyl 6-chloro-8-iodo-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylate (Example 73, Step 2) (1.00 g, 2.31 mmol) and 3-methoxyphenylboronic acid (0.369 g, 2.43 mmol) were dissolved in 1-propanol (50 mL). The mixture was stirred at room temperature for 0.5 hours, allowing for the solids to dissolve. The resulting solution was treated with palladium (II) acetate (0.016 g, 0.0693 mmol), triphenylphosphine (0.055 g, 0.208 mmol), sodium carbonate (0.294 g, 2.77 mmol), and deionized water (10 mL). The reaction mixture was heated to reflux for 3 hours. After cooling to room temperature the mixture was extracted with ethyl acetate (1×150 mL, 2×25 mL). The combined organic phases were washed with saturated aqueous NaHCO3 (50 mL) and brine (2×50 mL), dried over MgSO4, filtered, and concentrated in vacuo to yield a yellow oil. The crude material was purified by flash chromatography in 0.5% ethyl acetate in hexane yielding a white solid. The solid was recrystallized from hexane yielding the desired ester as a white solid (0.60 g, 63%): mp 93.7–95.1° C. 1H NMR (CDCl3/300 MHz) 7.69 (s, 1H), 7.35–7.32 (m, 2H), 7.22 (d, 1H, J=2.6 Hz), 7.05–7.03 (m, 2H), 6.96–6.93 (m, 1H), 5.72 (q, 1H, J=6.7 Hz), 4.34–4.31 (m, 2H), 1.35 (t, 3H, J=7.1 Hz). FABLRMS m/z 413 (M+H). ESHRMS m/z 413.0765 (M+H, Calc'd. 413.076747). Anal. Calc'd. for C20H16ClF3O4: C, 58.19; H, 3.91; Cl, 8.59. Found: C, 58.33; H, 4.10; Cl, 8.61.

1. dissolutionto dissolve
2. temperatureThe reaction mixture was heated
3. temperatureto reflux for 3 hours
4. temperatureAfter cooling to room temperature the mixture
5. extractionwas extracted with ethyl acetate (1×150 mL, 2×25 mL)
6. washThe combined organic phases were washed with saturated aqueous NaHCO3 (50 mL) and brine (2×50 mL)
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto yield a yellow oil
11. customThe crude material was purified by flash chromatography in 0.5% ethyl acetate in hexane yielding a white solid
12. customThe solid was recrystallized from hexane yielding the desired ester as a white solid (0.60 g, 63%)