反应详情

温度

-60 °C

A solution of 1.3M s-BuLi in cyclohexane (20.3 mL, 26.4 mmol) was added to an ether/liquid nitrogen cooled solution of N-ethyl-2-fluorobenzamide (2.00 g, 11.98 mmol) in THF (75 mL) and ether (75 mL), maintaining the internal reaction temperature ≤-95° C. The resulting mixture was stirred at this temperature for 30 min, then TMSCl (1.43 g, 13.2 mmol) was added and the mixture warmed to -60° C. After 2 h, the reaction was poured into water (200 mL). The organic layer was dried (MgSO4), concentrated, and purified by silica gel chromatography, eluted with 3:7 ethyl acetate/hexanes, to afford 0.45 g of the title compound as a white solid, a 16% yield. m.p. 86°-87° C.

1. temperaturemaintaining the internal reaction temperature ≤-95° C
2. waitAfter 2 h
3. dry with materialThe organic layer was dried (MgSO4)
4. concentrationconcentrated
5. custompurified by silica gel chromatography
6. washeluted with 3:7 ethyl acetate/hexanes