反应详情

A solution of 4-nitro-2-(tetrahydro-2H-pyran-2-yl)-2H-indazole (2.336 g, 9448 μmol) was dissolved in EtOAc (100 mL) and treated with 10% Pd/C (100 mg). The resulting suspension was stirred under an atmosphere of H2. for 16 h after which time reduction was complete. The reaction mixture was filtered, concentrated and purified by flash chromatography on silica (50% EtOAc/hexane) to give 2-(tetrahydro-2H-pyran-2-yl)-2H-indazol-4-amine (584 mg, 28.5% yield) as a dry orange foam. 1H NMR (400 MHz, d6-DMSO) δ 8.47 (s, 1H); 6.92 (t, J=7.82 Hz, 1H); 6.72 (d, J=8.61 Hz, 1H); 5.99 (d, J=7.04 Hz, 1H); 5.54-5.69 (m, 3H); 3.98 (d, J=11.74 Hz, 1H); 3.63-3.78 (m, 1H); 2.02-2.13 (m, 2H); 1.87-2.00 (m, 1H); 1.65-1.80 (m, 1H); 1.59 (br. s., 2H). m/z (ESI, +ve). Found 218.1 (M+H)+.

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated
3. custompurified by flash chromatography on silica (50% EtOAc/hexane)