反应详情

Diethyl malonate (9.8 g, 1.1 eq) was added to a stirred suspension of sodium hydride (60% in mineral oil, 2.09 g) in DMF (88 mL) over 15 min. at 0° C. under nitrogen. The reaction mixture was allowed to warm to room temperature and stirred for 1 h. A solution of 2-cyclopropylmethoxy-4-fluoro-1-nitrobenzene (10 g, 1 eq) in DMF (88 mL) was added drop wise at 0° C., and the reaction mixture was heated to 100° C. for 3 h. The reaction mixture was allowed to cool to room temperature, poured into ice water and extracted with EtOAc (3×100 mL). The combined organic phases were washed with water (3×100 mL) and brine (100 mL), dried (MgSO4) and filtered. Evaporation of the volatiles under reduced pressure gave 10.0 g of crude product which was purified by chromatography over silica gel (hexane/EtOAc) gave of diethyl 2-(3-(cyclopropylmethoxy)-4-nitrophenyl)malonate (7.0 g). 1H-NMR (CDCl3, 200 MHz): 0.4 (m, 2H), 0.71 (m, 2H), 1.3 (m, 1H), 1.3 (t, 6H), 3.96 (d, 2H), 4.25 (q, 4H), 4.5 (s, 1H), 7.02 (d, 1H), 7.18 (s, 1H), 7.81 (d, 2H).

1. temperaturethe reaction mixture was heated to 100° C. for 3 h
2. temperatureto cool to room temperature
3. extractionextracted with EtOAc (3×100 mL)
4. washThe combined organic phases were washed with water (3×100 mL) and brine (100 mL)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customEvaporation of the volatiles under reduced pressure
8. customgave 10.0 g of crude product which
9. customwas purified by chromatography over silica gel (hexane/EtOAc)