4-nitro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole → 1-(Oxan-2-yl)-1H-indazol-4-amine

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A solution of 4-nitro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (1.05 g, 4247 μmol) in EtOAc (100 mL) was treated with 10% Pd/C (60 mg) and stirred under an atmosphere of H2. The reaction was monitored by LCMS and found to be complete after 22 h. The reaction was filtered and concentrated (caution: tends to foam/bump). The residue was triturated with Et2O to give 1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-amine (892 mg, 96.7% yield) as an off-white solid. 1H NMR (400 MHz, d6-DMSO) δ 8.11 (s, 1H); 7.03 (t, J=7.82 Hz, 1H); 6.74 (d, J=8.22 Hz, 1H); 6.18 (d, J=7.43 Hz, 1H); 5.78 (s, 2H); 5.59-5.67 (m, 1H); 3.82-3.92 (m, 1H); 3.63-3.74 (m, 1H); 2.30-2.45 (m, 1H); 1.96-2.08 (m, 1H); 1.84-1.94 (m, 1H); 1.65-1.80 (m, 1H); 1.55 (br. s., 2H). m/z (ESI, +ve) Found 218 (M+H)+.

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