2-Butyn-1-ol → 4,5-Dichloro-6-(2-butynyloxy)pyrimidine

Participants

Reaction Steps

In 18 ml of tetrahydrofuran was suspended 0.56 g of sodium hydride (60% in oil), to which 2 ml of a tetrahydrofuran solution containing 0.8 g of 2-butyn-1-ol was slowly added dropwise with stirring at room temperature. The mixture was stirred at room temperature for 20 minutes and then cooled to 0° C., to which 3 ml of a tetrahydrofuran solution containing 2 g of 4,5,6-trichloropyrimidine was slowly added dropwise, followed by further stirring at 0° C. for 2 hours. The reaction mixture was then poured into a saturated aqueous ammonium chloride solution and extracted three times with ethyl acetate. The organic layers were combined, washed with brine, dried over anhydrous magnesium sulfate, and then concentrated. The residue was subjected to silica gel column chromatography to give 2.23 g of 4,5-dichloro-6-(2-butynyloxy)pyrimidine.

Provenance & Evidence