反应详情

A mixture of 3-(2,4-dichlorophenyl)-7-hydroxy-8-iodo-4-(4-(2-pyrrolidin-1-yl-ethoxy)-benzyl)-chromen-2-one (1.85 g, 2.91 mmol), K2CO3 (1.21 g, 8.75 mmol), trimethylboroxine (427 μL, 3.05 mmol) and Pd(Ph3P)4 (336 mg, 0.29 mmol) in anhydrous dioxane (22 mL) was stirred at reflux temperature for 2.5 h. After cooling the resultant green suspension to room temperature, the solvent was removed in vacuo. The resultant residue was dissolved in CH2Cl2, and the organic layer was washed with H2O and brine, dried (MgSO4) concentrated in vacuo. The resultant residue was purified using flash chromatography (125 g silica gel, 8:0.5:0.5→7:0.5:0.5 CH2Cl2:MeOH:AcOEt→9:1 CH2Cl2:MeOH) to afford a yellow solid that was further purified using reverse phase HPLC (followed by an extraction with CH2Cl2/NaHCO3). The title compound was isolated as a yellow solid (220.4 mg, 14%). 1H NMR (300 MHz, CDCl3) δ 7.48 (d, J=2.0 Hz, 1H), 7.24 (dd, J=2.0, 8.0 Hz, 1H), 7.18 (d, J=8.8 Hz, 1H), 7.12 (d, J=8.0 Hz, 1H), 6.90 (d, J=8.8 Hz, 2H), 6.84 (d, J=8.8 Hz, 1H), 6.72 (d, J=8.8 Hz, 2H), 4.23 (t, J=5.0 Hz, 2H), 4.00 (d, J=15.5 Hz, 1H), 3.74 (d, J=15.5 Hz, 1H), 3.24 (t, J=5.0 Hz, 2H), 3.15–3.04 (m, 4H), 2.20 (s, 3H), 2.05–1.93 (m, 4H); MS (ESI) m/z 523.8 (M)+; HPLC tR 4.74 min.

1. temperatureat reflux temperature for 2.5 h
2. customthe solvent was removed in vacuo
3. dissolutionThe resultant residue was dissolved in CH2Cl2
4. washthe organic layer was washed with H2O and brine
5. dry with materialdried (MgSO4)
6. concentrationconcentrated in vacuo
7. customThe resultant residue was purified
8. customMeOH:AcOEt→9:1 CH2Cl2:MeOH) to afford a yellow solid
9. customthat was further purified
10. extractionfollowed by an extraction with CH2Cl2/NaHCO3)