反应详情

温度

90 °C

A mixture of 3-benzothiazol-2-yl-5-bromopyridin-2-ylamine (BB7) (1.37 g, 4.5 mmol), 3-(carbomethoxy)phenylboronic acid (0.85 g, 4.7 mmol), Pd(PPh3)4 (5 mol %), and Cs2CO3 (3.5 g, 10.8 mmol) in dioxane/H2O (4:1, 30 mL) were heated under nitrogen at 90° C. for 5 h. Solvents were removed in vacuo, water (10 mL) was added to the residue, and the mixture was extracted with EtOAc (3×10 mL). The combined EtOAc extracts were dried over Na2SO4, filtered, and concentrated in vacuo. The crude material thus obtained was purified by column chromatography on silica gel using mixtures of EtOAc/Hexanes to give the title compound. 1H NMR (CDCl3, 300 MHz): δ=7.28 (brs, 2H), 7.41 (t, J=6.9 Hz, 1H), 7.51 (t, J=6.9 Hz, 1H), 7.64 (d, J=7.5 Hz, 1H), 7.77 (d, J=6.3 Hz, 1H), 7.92 (d, J=7.8 Hz, 1H), 8.01-8.05 (m, 2H), 8.18 (d, J=2.1 Hz, 1H), 8.26 (t, J=1.8 Hz, 1H), 8.47 (d, J=2.1 Hz, 1H).

1. customSolvents were removed in vacuo, water (10 mL)
2. additionwas added to the residue
3. extractionthe mixture was extracted with EtOAc (3×10 mL)
4. dry with materialThe combined EtOAc extracts were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude material thus obtained
8. customwas purified by column chromatography on silica gel using mixtures of EtOAc/Hexanes