Methanol → HCID 69889855, compound

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Reaction Steps

The preparation of ethyl 3-methyl-1-(3-fluoro-2-naphthyl)-1H-pyrazole-5-carboxylate was the same as that in Step 3 for Example 3. This ester (13.2 g, 44 mmol) was dissolved in 80 mL methanol. To it were added LiOH.H2O (3.7 g, 49 mmol) and 40 mL water. The mixture was stirred for overnight at room temperature. It was evaporated in vacuuo to remove methanol. The residue was acidified with 1N HCl till pH 1. The mixture was extracted with EtOAc (×4). The organic extracts were combined, dried, evaporated and pumped to dryness to afford 3-methyl-1-(3-fluoro-2-naphthyl)-1H-pyrazolecarboxylic acid in over 90% yield. ES-MS: (M+H)+ 271.

Provenance & Evidence