反应详情

温度

90 °C

A mixture of 3,3-dimethyl-3H-benzo[c][1,2]oxaborol-1-ol (66.5 mg, 0.411 mmol), 5-bromo-2-(4-trifluoromethyl-phenoxymethyl)-1H-benzimidazole (76.2 mg, 0.205 mmol), PdCl2(dppf)2.CH2Cl2 (34 mg, 0.041 mmol), and tetrabutylammonium bromide (66 mg 0.205 mmol) in 8 mL of DME and 1.64 mL of Na2CO3 solution (1.0 M) was degassed and purged with argon twice. The mixture was then heated to 90° C. for 12 h. The mixture was then cooled to room temperature, and filtered though a pad of Celite 545. The filtrate was concentrated under reduced pressure to yield a dark brown oil. The residue was purified by chromatography (silica, ethyl acetate:hexanes, 1:1) to afford the title compound as an off-white solid (26.8 mg, 30%). 1H NMR (400 MHz, CD3OD) δ (ppm): 7.81 (dd, 1H, J=8.1 Hz, J=1.1 Hz), 7.63 (m, 2H), 7.56 (m, 1H), 7.45 (m, 1H), 7.34 (td, 1H, J=7.8 Hz, J=1.5 Hz), 7.16-7.26 (m, 4H), 7.05 (dd, 1H, J=7.4 Hz, J=1.7 Hz), 5.44 (s, 2H), 1.32 (s, 6H). Mass Spectrum (LCMS, ESI pos.) Calcd. For C24H21F3N2O2: 427.43 (M+H), Found 427.1.

1. custompurged with argon twice
2. temperatureThe mixture was then cooled to room temperature
3. filtrationfiltered though a pad of Celite 545
4. concentrationThe filtrate was concentrated under reduced pressure
5. customto yield a dark brown oil
6. customThe residue was purified by chromatography (silica, ethyl acetate:hexanes, 1:1)