Lithium Hydroxide → 1-isopropyl-3-(thiophen-2-yl)-1H-pyrazole-5-carboxylic acid

Participants

Reaction Steps

To a solution of ethyl 1-isopropyl-3-(thiophen-2-yl)-1H-pyrazole-5-carboxylate (0.88 g, 3.3 mmol) in THF (10 mL) was added aq. LiOH solution (0.42 g, 10 mmol, 5 mL) and the mixture was stirred for 16 h at RT. Solvents were removed and the thick liquid was diluted with water (5 mL) and acidified with 3M HCl solution to pH 4-5. The product precipitated and was filtered, washed with water and dried to afford 1-isopropyl-3-(thiophen-2-yl)-1H-pyrazole-5-carboxylic acid as a white solid (0.69 g, 88% yield).

Provenance & Evidence