Methyl 1-(1-methylethyl)-6-nitro-1H-indazole-4-carboxylate → Methyl 6-amino-1-(1-methylethyl)-1H-indazole-4-carboxylate

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Reaction Steps

Methyl 1-(1-methylethyl)-6-nitro-1H-indazole-4-carboxylate (1.39 g, 5.28 mmol) was dissolved in ethanol (70 mL) and hydrogenated using an H-Cube instrument (full H2 mode and 10% Pd/C). The solvent was removed in vacuo and the residue was purified via silica gel chromatography (eluent: 0% to 40% gradient; EtOAc:Hex). The product was obtained as 1.05 g (85%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.58 (d, J=6.57 Hz, 6H), 4.00 (s, 5H), 4.70 (dt, J=13.39, 6.69 Hz, 1H), 6.80 (s, 1H), 7.37 (d, J=2.02 Hz, 1H), 8.30 (s, 1H). LCMS(ES) [M+H]+234.0

Provenance & Evidence