Hydrazine hydrate (1:1) → 4-(4-Amino-phenyl)-1H-pyrazolo[3,4-c]pyridin-3-ylamine

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Reaction Steps

The product from Example 1C (1.4 g) in hydrazine hydrate (10 mL) was heated at 110° C. for 3 hours, cooled to room temperature, and partitioned between water and ethyl acetate. The organic layer was dried (Na2SO4), filtered, and the filtrate was concentrated under reduced pressure. The residue was purified via silica gel chromatography eluting with 8% methanol in CH2Cl2 to provide 0.5 g of the title compound as a yellow solid. MS (ESI(+)) m/e 225 (M+H)+.

Provenance & Evidence