Ammonia → (2E)-3-(1-methyl-1H-pyrazol-4-yl)prop-2-enoic acid

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Reaction Conditions

Reaction Steps

A mixture of 1-methyl-1H-pyrazole-4-carbaldehyde (13 g, 118 mmol), malonic acid (12.29 g, 118 mmol), pyridine (65 ml) and piperidine (0.234 ml, 2.361 mmol) was heated to 110° C. under argon for 4 h. After cooling, water (100 ml) was added, followed by aqueous ammonia (12 ml) to obtain a clear solution, which was acidified to pH˜1 with hydrochloric acid. The precipitate was collected by filtration, washed with water and dried to obtain the title compound (7.5 g, 40.5% yield). LCMS: rt=0.92 min, [M+H+]=153

Provenance & Evidence