Methanol → HCID 178515507, compound

Participants

Reaction Steps

To a solution of 3-(5-bromo-thiophen-2-yl-3-oxo-propionic acid methyl ester (2.0 g, 7.60 mmol) in 1.2 M HCl in MeOH (20 mL) was added 2-chlorophenylhydrazine hydrochloride (1.43 g, 7.98 mmol). The reaction mixture was heated to reflux for 4 hours and cooled off. The solvent was evaporated and the residue was purified by flash column chromatography with 10% ethyl acetate in hexane. The product 5-(5-bromo-thiophene-2-yl)-1-(2-chloro-phenyl)-1H-pyrazole-3-ol was recovered as a white solid (1.89 g, 70% yield. MS (ES): 355 [M+H]+.

Provenance & Evidence