Lithium hydroxide, monohydrate → 1-isopropyl-3-methyl-6-(pyridin-3-yl)-1H-indazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of methyl 1-isopropyl-3-methyl-6-(pyridin-3-yl)-1H-indazole-4-carboxylate, 1 (0.5 g, 1.618 mmol) in a mixture of THF and H2O (30 mL) was added LiOH.H2O (0.2 g, 4.85 mmol) and the mixture was refluxed at 80° C. for 8 h. THF was distilled off and the aqueous layer was adjusted to pH˜5 with 10% HCl at 0° C. and the precipitated solid was collected by filtration and dried to afford 1-isopropyl-3-methyl-6-(pyridin-3-yl)-1H-indazole-4-carboxylic acid as an off-white solid (0.51 g). LCMS (ES+) m/z: 296.7.

Provenance & Evidence