Water → 5-(4-Chlorobut-1-yn-1-yl)-4-fluoro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole

Participants

Reaction Steps

To a mixture of 4-(4-fluoro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-5-yl)but-3-yn-1-ol (4.6 g, 16.0 mmol) in pyridine (50 mL), was added POCl3 (10.3 g, 67.3 mmol). The resulting solution was stirred at room temperature for 2 hours. Upon completion, the reaction solution was poured into water (250 mL) and extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified on silica gel column (0˜10% EtOAc in petroleum ether) affording the title compound (2.62 g). 1H NMR (300 MHz, DMSO-d6): δ 8.13 (s, 1H), 7.58 (d, 1H), 7.43 (dd, 1H), 5.87 (dd, 1H), 3.90-3.69 (m, 2H), 3.83 (t, 2H), 2.98 (t, 1H), 2.41-2.29 (m, 1H), 2.06-1.94 (m, 2H), 1.78-1.70 (m, 1H), 1.60-1.54 (m, 2H); LCMS: 307 (M+H)+.

Provenance & Evidence