Sulfuric Acid → [3,5-Dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-ylmethyl)-phenyl]-acetonitrile

Participants

Reaction Steps

A suspension of sodium cyanide (270 mg, 5.51 mmol) in dimethyl sulfoxide (2 mL) at room temperature was treated with concentrated sulfuric acid (0.1 mL, 1.88 mmol) and a solution of 6-(4-bromomethyl-2,6-dichloro-benzyl)-4-isopropyl-pyridazin-3-one (54) (70 mg, 0.180 mmol) in dimethyl sulfoxide (2 mL). The reaction mixture was stirred at room temperature for 30 min and then at 50° C. for 1 h. The reaction was cooled to room temperature, poured into a saturated aqueous sodium bicarbonate solution (50 mL), was diluted with water (20 mL) and then extracted with ethyl acetate (3×75 mL). The organic layers were combined and washed with a saturated aqueous sodium chloride solution (50 mL), dried over magnesium sulfate, filtered, and concentrated under vacuum. The resulting oil was dried under high vacuum to afford [3,5-dichloro-4-(5-isopropyl-6-oxo-1,6-dihydro-pyridazin-3-ylmethyl)-phenyl]-acetonitrile (55) as an orange oil (assume 0.180 mmol) which was used without further purification.

Provenance & Evidence