Hydrochloric Acid → HCID 22174848, compound

Participants

Reaction Steps

To a cold (−78° C.) suspension of 2-(4fluorophenyl)-6-(trifluoromethyl)pyrazolo[1,5-a]pyridine-3-carbaldehyde (11.4 g, 37.0 mmol) in tetrahydrofuran (100 mL) was added ethynylmagnesium bromide (111 mL, 0.5 M in tetrahydrofuran, 56 mmol). The reaction mixture was warmed to room temperature and stirred for 14 hours. The reaction mixture was poured into water and adjusted to neutral pH with 1N aqueous hydrochloric acid. The aqueous mixture was extracted with ethyl acetate. The combined extracts were washed with water and brine. The organic layer was dried over magnesium sulfate. Filtration and concentration provided 1-[2-(4-fluorophenyl)-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-ol (11.9 g, 96%) as a tan solid. Rf 0.18 (4:1 hexanes:ethyl acetate); 1H NMR (300 MHz, CDCl3) δ 8.81 (s, 1H), 8.15 (d, 1H), 7.75 (m, 2H), 7.35 (d, 1H), 7.19 (t, 2H), 5.76 (s, 1H), 2.71 (d, 1H, 2.60 (d, 1H); MS m/z 335 (M+1).

Provenance & Evidence