Hydrochloric Acid → 1H-Indazole-3-carboxylic acid, 1-methyl-

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A solution of 1-methylindazole-3-carboxylic acid, methyl ester (1.00 g, 0.0053 mol) was stirred in a mixture of methanol (10 mL)/2N NaOH solution (120 mL) at reflux temperature for 2 hours. After cooling, the mixture was diluted with water (100 mL) and acidified with 6N HCl solution. The white solid that formed was collected by filtration and dried under ambient conditions for 6 days to give 0.86 g (92% yield) of the product; mp 215°-216° C.

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