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With lithium aluminium tetrahydride; In tetrahydrofuran; at 0℃;Reflux;
To the above product (5 g, 35.97 mmol) in THF (70 mL) was added LiAlH4 (4.1 g, 107.89 mmol) in several batches at 00C. The resulting solution was refluxed for 1 hr. The solids were filtered out and the filtrate was concentrated, resulted in 3 g (67%) of 1,5- dimethyl-lH-pyrazol-3-yl)methanamine as yellow oil.