Potassium Iodide → 6-amino-2-(4-methoxy-benzyl)-5-methyl-2H-indazole-7-carboxylic acid

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Reaction Steps

To a suspension of 6-amino-5-methyl-1H-indazole-7-carboxylic acid (0.956 g, 5 mmol) in dimethylformamide (4 ml) was added sodium hydrogenocarbonate (0.462 g, 5.5 mmol) and the resulting mixture was stirred at 40° C. for 15 minutes before 4-methoxybenzyl chloride (0.861 g, 5.5 mmol) was introduced. A catalytic amount of potassium iodide was added and the mixture was stirred for 18 hours at that temperature. After cooling down, the crude mixture was placed on top of a silica gel column and the product was purified by flash chromatography using a gradient starting from 50% ethyl acetate-50% cyclohexane to 100% ethyl acetate, then 1% acetic acid in ethyl acetate. The fractions containing the desired compound were evaporated and the residue was triturated with diethyl ether and filtered to yield light orange crystals.

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