Water → 1-[7-Chloro-2-(3-methyl-2-furyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-ol

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Reaction Steps

To a solution of 7-chloro-2-(3-methyl-2-furyl)pyrazolo[1,5-a]pyridine-3-carbaldehyde (11.56 g, 44.3 mmol) in tetrahydrofuran (200 mL) at −78° C. was added ethynylmagnesium bromide (133 mL, 0.5 M in tetrahydrofuran, 66.5 mmol). The mixture was allowed to warm to room temperature and stirred for 1 hour. Water was added to the reaction and the resulting mixture was extracted with ethyl acetate. The ethyl acetate phase was dried over magnesium sulfate, filtered and concentrated to a solid residue, 1-[7-chloro-2-(3-methyl-2-furyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propyn-1-ol (12.29 g, 97%). 1H-NMR (CDCl3): δ 7.97 (d, 1H), 7.48 (d, 1H), 7.16 (t, 1H), 6.96 (d, 1H), 6.42 (d, 1H), 6.18 (m, 1H), 2.78 (m, 1H), 2.6 (d, 1H), 2.46 (s, 3H). MS m/z 287 (M+1).

Provenance & Evidence