Phosphoric Acid → HCID 15279442, compound

Participants

Reaction Steps

2.0 g of 2,2,2-trifluoroethanol are introduced into 80 ml of dimethylformamide and 0.60 g of 80% strength sodium hydride is added at room temperature. After 1 h, a clear solution has formed and 5.0 g of 2,2-dimethyl-5-trimethylsilylethynyl-4H-(1,3)benzodioxin-4-one are added at room temperature. After 20 min, 4.0 g of 4,6-dimethoxy-2-methylsulfonylpyrimidine are added and the reaction solution is stirred overnight at room temperature. It is then poured into 400 ml of water containing phosphoric acid (pH 3) at 0° C. and extracted with methyl tert-butyl ether, and the combined organic phases are washed with water, dried over sodium sulfate and concentrated. 6.4 g of crude product remain, which is chromatographed on silica gel using n-hexane/ethyl acetate. A colorless oil (1.2 g) is obtained. 1H-NMR (CDCl3): δ=3.33 (s); 3.83 (s); 4.55 (q); 5.80 (s); 7.25-7.50 (m).

Provenance & Evidence