Hydrochloric Acid → HCID 178433895, compound

Participants

Reaction Steps

50 mg of the methyl 4-([2-(1-{5-hydroxy-3-methyl-1[5-(trifluoromethyl)-2-pyridinyl]-1H-pyrazol-4-yl}ethylidene)hydrazino]carbonyl)benzoate synthesized in 1) was heated in 3 ml of methanol and 0.3 ml of 1M aqueous sodium hydroxide at 60° C. for 8 hours with stirring. After it was cooled to room temperature, 0.3 ml of 1M hydrochloric acid was added to precipitate crystals, and crystals were collected by filtration and dried to obtain 30 mg of the desired product, 4-[(2-{1-[3-methyl-5-oxo-1-(5-trifluoromethyl-2-pyridinyl)-1,5-dihydropyrazol-4-ylidene]-ethyl}hydrazino)carbonyl]benzoic acid as a pale brown solid (yield 62%).

Provenance & Evidence