反应详情

温度

120 °C

To a solution of the title compound from step 1 (450 mg, 1.74 mmol) in DMF (5 mL) was added LiCl (370 mg, 8.72 mmol) and TsOH H2O (1.52 g, 8.72 mmol) at room temperature. The mixture was heated to 120° C. and stirred for 1 hour. The mixture was diluted with water (100 mL) and extracted with EtOAc (3×100 mL). The combined organic phase was washed with saturated brine (2×200 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to afford the title compound (380 mg, yield: 88.9%) as yellow solid which used directly for the next step without further purification. 1H NMR (CDCl3, 400 MHz) δ 7.49 (s, 1H), 5.91 (s, 1H), 3.87 (d, J=6.8 Hz, 2H), 1.36-1.22 (m, 1H), 0.71-0.67 (m, 2H), 0.46-0.42 (m, 2H). LCMS: 244.0 (M+1)+; 246.0

1. extractionextracted with EtOAc (3×100 mL)
2. washThe combined organic phase was washed with saturated brine (2×200 mL)
3. dry with materialdried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure