反应详情

A solution of benzylidene malonate (14.2 g) in DMF (280 mL) was treated with sodium hydride (2.57 g, 95%). A solution of 4-fluoro-2-nitrotoluene in DMF (10 mL) was added over 1 H, and the reaction mixture was stirred at RT overnight and then quenched by the addition of glacial acetic acid (175 mL) at 0° C. A total of 500 mL of 70:30 water-methanol was added with stirring, and the organics were extracted with ethyl acetate. The organic extracts were combined and washed with saturated aqueous potassium carbonate solution (2×) and brine, dried over sodium sulfate, filtered, and concentrated in vacuo to give a dark brown oil. Flash chromatography on silica gel (75:25 hexane-ethyl acetate, then 50:50 hexane-ethyl acetate) provided 7.0 g (30%) of the title compound as a red-brown solid. 1H NMR (300 MHz, CDCl3) δ 3.72 (d, 2H), 3.73 (d, 1H), 4.32 (m, 1H), 7.09-7.29 (m, 7H), 7.71 (m, 1H). MS APCI, m/z=398 (M+Na). LC/MS: 2.66 min.

1. customquenched by the addition of glacial acetic acid (175 mL) at 0° C
2. additionA total of 500 mL of 70:30 water-methanol was added
3. stirringwith stirring
4. extractionthe organics were extracted with ethyl acetate
5. washwashed with saturated aqueous potassium carbonate solution (2×) and brine
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customto give a dark brown oil