2-Chloro-5-nitropyrimidine → 2-[(3,3-Dimethyl-2,3-dihydro-1-benzofuran-4-yl)oxy]-5-nitropyrimidine

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반응 단계

To a solution of 3,3-dimethyl-2,3-dihydro-1-benzofuran-4-ol (Intermediate 50, 724 mg) in dry N,N-Dimethylformamide (40 mL) potassium carbonate and 2-chloro-5-nitropyrimidine (774 mg, 4.85 mmol) were added. The reaction mixture was stirred at room temperature overnight. The reaction was quenched with water (40 ml) and extracted with ethyl acetate (3×40 ml). The combined organic layers were washed with brine (2×50 ml), separated, dried over sodium sulphate, filtered and evaporated. The residue was purified by flash chromatography on silica gel using a column SNAP 50 g and cyclohexane/ethyl acetate as eluents from 100/0 to 70/30 to afford the title compound (1.257 g) as a yellow oil.

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