反应详情

温度

-78 °C

To a solution of 6-bromo-1,4-dihydro-indeno[1,2-c]pyrazole (0.100 g, 0.425 mmol, see U.S. Pat. No. 6,297,238 for preparation) in THF (3 mL) at −78° C. was added PhLi in cyclohexane/ether (1.8 M, 0.71 mL, 1.28 mmol) followed by s-BuLi in cyclohexane (1.3 M, 0.98 mL, 1.28 mmol) 30 minutes later. The reaction mixture was stirred at −78° C. for 60 minutes and DMF (0.33 mL, 4.25 mmol) was added. The dry ice bath was removed after 30 minutes. After an additional 30 minutes, the reaction was quenched with water. The reaction mixture was extracted with EtOAc, washed with 50% brine, dried over MgSO4, filtered, and concentrated. The concentrate was purified by flash chromatography eluted with EtOAc/hexane (7:3 to 8:2) to give 0.053 g (68%) of the desired product as brown solid. MS (DCI/NH3) m/z: 185.0 (M+H)+; 1H NMR (300 MHz, CD3OD) δ ppm 3.76 (s, 2H), 7.63 (s, 1H), 7.62-7.97 (m, 2H), 8.04 (s, 1H), 10.00 (s, 1H).

1. customThe dry ice bath was removed after 30 minutes
2. waitAfter an additional 30 minutes
3. customthe reaction was quenched with water
4. extractionThe reaction mixture was extracted with EtOAc
5. washwashed with 50% brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated
9. customThe concentrate was purified by flash chromatography
10. washeluted with EtOAc/hexane (7:3 to 8:2)