Sodium Carbonate → 5-Chloro-2-methylpyridazin-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.50 g (10.70 mmol) of 5-methoxy-2-methyl-2H-pyridazin-3-one and 7.8 ml (13.1 g, 85.6 mmol) of phosphorus oxychloride was heated at 110° C. for 2 h. After allowing to cool to room temperature, the mixture was poured into 100 ml of ice/water with vigourous stirring. After neutralization by addition of saturated sodium carbonate solution, the compound was worked up with methylene chloride/water, dried over magnesium sulfate and concentrated in vaccuo. The crude material was purified by flash chromatography on silicagel using a 80:20 mixture of ethyl acetate and heptane as eluant to yield 904 mg (6.25 mmol, 58%) of the title compound as a crystalline white solid, MS: 141.2 (M+H+).

Provenance & Evidence