7-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carbaldehyde → 1-[7-Chloro-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-ol

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Reaction Steps

In a similar manner as described in Example 34 from 7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridine-3-carbaldehyde (5.49 g, 20.0 mmol) and ethynylmagnesium bromide (100 mL, 0.5 M in tetrahydrofuran, 50.0 mmol) at 0° C., recrystallized from dichloromethane, was obtained 1-[7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-3-yl]-2-propyn-1-ol (5.3 g, 88%) as a pale yellow crystalline solid. 1H NMR (CDCl3): δ 8.04 (d, 1H), 7.79 (m, 2H), 7.20 (m, 3H), 7.01 (d, 1H), 5.77 (m, 1H), 2.69 (d, 1H), 2.32 (d, 1H); MS m/z 301 (M+1).

Provenance & Evidence