反应详情

640 mg of compound 229.1 were dissolved in 12 ml of dry tetrahydrofuran and admixed with 138 mg of sodium hydride (60% in mineral oil). The mixture was stirred at room temperature for one hour, then a solution of 393 μl of methyl iodide in 5 ml of dry tetrahydrofuran was added dropwise and the resulting mixture was stirred at room temperature overnight. For workup, the reaction mixture was admixed cautiously with water and ethyl acetate. The organic phase was removed, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography (silica gel; n-heptane/0-10% ethyl acetate). Dimethyl 2-methyl-2-(4-nitrophenyl)malonate (231.1) was obtained; 1H NMR: 8.22, d, 2H, 7.61, d, 2H, 3.71, s, 6H, 1.82, s, 3H.

1. stirringthe resulting mixture was stirred at room temperature overnight
2. customThe organic phase was removed
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by chromatography (silica gel; n-heptane/0-10% ethyl acetate)