Diethylene Glycol Monoethyl Ether → 3-Oxo-2-(4-tert-butylphenyl)-3-(1,3,4-trimethylpyrazol-5-yl)propionitrile

Participants

Reaction Conditions

Reaction Steps

In a 300 mL-reaction flask equipped with a rectification column and a separating tank, 11.3 g (65.2 mmol) of 4-tert-butylphenylacetonitrile, 10.8 g (59.5 mmol) of 1,3,4-trimethylpyrazol-5-carboxylic acid ethyl ester, 100 g of heptane, and 1.5 g of diethylene glycol monoethyl ether were added, the atmosphere was substituted with nitrogen, then azeotropic dehydration was carried out by heating at 90 to 95° C. for 1 hour. The temperature was maintained, 13.8 g (71.5 mmol) of 28% sodium methoxide methanol solution was added dropwise over 3 hours, and the resulting mixture was further reacted for 7 hours. After cooling to 30° C. or less, 108 g of water was added to separate out heptane phase and obtain an aqueous phase. A quantitative analysis of the obtained aqueous phase with liquid chromatography showed that the aqueous phase contained 15.7 g (yield 85.8%) of 3-oxo-2-(4-tert-butylphenyl)-3-(1,3,4-trimethylpyrazol-5-yl) propionitrile.

Provenance & Evidence