Water → 1-(6-Fluoro-3-methyl-1H-indazol-1-yl)ethanone

Participants

Reaction Conditions

Reaction Steps

6-Fluoro-3-methyl-1H-indazole (2.79 g, 18.6 mmol) in CH2Cl2 (50 mL) was treated with acetic anhydride (2.8 g, 30 mmol), Hunig's base (5.2 mL, 30 mmol) and DMAP (0.2 g, 1.7 mmol). The mixture was stirred 1 h at 20° C., poured into water (100 mL) and extracted with CH2Cl2 (2×100 mL). The extracts were dried (Na2SO4), concentrated and the residue recrystallised from hexane to give the title compound (3.41 g, 96%) as a white crystalline solid; mp 89°-91° C. (from hexane); 1H NMR (360 MHz, CDCl3) δ 8.05 (dd, J=9.4, 2.2 Hz, 1H, indazole), 7.51 (dd, J=8.7, 5.1 Hz, 1H, indazole), 7.03 (dt, J=8.8, 2.2 Hz, 1H, indazole), 2.67 (s, 3H, Me), 2.49 (s, 3H, Ac); MS (CI+) m/e 193 (M+H+); Anal. calcd for C10H9FN2O: C, 62.49; H, 4.72; N, 14.58. Found: C, 62.50; H, 4.79; N, 14.63.

Provenance & Evidence