反应详情

温度

0 °C

Sodium hydride (60% dispersion in oil, 3.95 g, 98.6 mmol) was added to anhydrous THF (100 mL) and cooled to 0° C. under nitrogen. A solution of di-tert-butyl malonate (9.79 g, 45.3 mmol) in THF (20 mL) was added dropwise and the reaction mixture was stirred 30 min. A solution of 2-[(3-bromo-5-chlorophenyl)oxy]-3,4-difluoro-1-nitrobenzene (15.0 g, 41.1 mmol) was added dropwise in THF (50 mL) was added dropwise, the reaction was allowed to warm to RT and stirred for 90 min. The reaction was cooled to 0° C., a solution of saturated aqueous NaHSO4 (200 mL) was added and the aqueous mixture was extracted with EtOAc (3×100 mL). The organic extracts were combined, dried over Na2SO4, filtered and evaporated to afford the title compound a brown solid. 1H NMR (400 MHz, DMSO-d6): δ ppm 8.05 (d, 1H), 7.58 (d, 1H), 7.48 (s, 1H), 7.20 (s, 1H), 7.12 (s, 1H), 3.82-3.80 (m, 1H), 1.35 (s, 18H).

1. additionwas added dropwise
2. temperatureto warm to RT
3. stirringstirred for 90 min
4. temperatureThe reaction was cooled to 0° C.
5. extractionthe aqueous mixture was extracted with EtOAc (3×100 mL)
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. customevaporated