反应详情

温度

90 °C

The product of Step 1 (900 mg, 3.35 mmol), Intermediate 5 (4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-furan-2-carboxylic acid amide, 1.8 g, 4.02 mmol), tetrakis palladium triphenylphosphine (970 mg, 0.84 mmol), sodium carbonate solution (1.5 M, 18 mL, 26.8 mmol) and dioxane (20 mL) are combined in a flask. The mixture is degassed with nitrogen for 10 min then sealed and heated at 90° C. for 18 h. The reaction mixture is cooled and the precipitate collected by filtration. The precipitate is washed with 2% methanol: dichloromethane (2 mL) to give the title compound as a white solid (910 mg, 91%). 1H-NMR (400 MHz, d6-DMSO)=1.74-1.76 (m, 2H), 2.22-2.26 (m, 2H), 2.32 (brs, 2H), 4.70 (brd, 1H, J=7.6), 7.58 (s, 1H), 7.86 (s, 1H), 7.97 (s, 1H), 8.12 (s, 1H), 8.35 (d, 1H, J=7.2), 8.69 (d, 1H, J=9.6). LCMS: Rt 2.63 min (90.4%), m/z (APCI) 299 (M+H)+.

1. customThe mixture is degassed with nitrogen for 10 min
2. customthen sealed
3. temperatureThe reaction mixture is cooled
4. filtrationthe precipitate collected by filtration
5. washThe precipitate is washed with 2% methanol