Triethylamine → 4-Fluoro-5-(4-fluorobut-1-yn-1-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole

Participants

Reaction Steps

To a solution of 4-(4-fluoro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-5-yl)but-3-yn-1-ol (3.4 g, 11.8 mmol; Intermediate 29, Step 1) in dry dichloromethane (100 mL), was added triethylamine.3HF (7.6 g, 47.2 mmol). XtalFluor-E (8.0 g, 34.9 mmol) was then added. The resulting solution was stirred at room temperature for 30 minutes. Upon completion, the reaction solution was neutralized by slow addition of saturated NaHCO3 (30 mL). The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (0˜20% EtOAc in petroleum ether), and then re-crystallized from petroleum ether to afford the title compound (1.3 g). 1H NMR (300 MHz, DMSO-d6): δ 8.27 (s, 1H), 7.58 (d, 1H), 7.44 (dd, 1H), 5.89 (dd, 1H), 4.60 (dt, 2H), 3.91-3.85 (m, 1H), 3.80-3.69 (m, 1H), 2.93 (dt, 2H), 2.46-2.28 (m, 1H), 2.06-1.95 (m, 2H), 1.78-1.67 (m, 1H), 1.60-1.52 (m, 2H); LCMS: 291 (M+H)+.

Provenance & Evidence