[F:1][C:2]([F:18])([F:17])[C:3]1[C:11]([C:12](OCC)=[O:13])=[C:6]2[CH:7]=[CH:8][CH:9]=[CH:10][N:5]2[N:4]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-].[OH-].[Na+]>O1CCCC1>[F:18][C:2]([F:1])([F:17])[C:3]1[C:11]([CH2:12][OH:13])=[C:6]2[CH:7]=[CH:8][CH:9]=[CH:10][N:5]2[N:4]=1A solution of 2.8 g (10.8 mmol) of ethyl 2-trifluoromethylpyrazolo[1,5-a]pyridine-3-carboxylate in 50 ml of tetrahydrofuran is added dropwise to a mixture of 0.5 g (11.9 mmol) of lithium aluminium hydride in suspension in 45 ml of tetrahydrofuran at −70° C. After stirring for 3 h at −70° C., the mixture is brought to ambient temperature, then 1.8 ml of a 2N aqueous sodium hydroxide solution is added. The mixture is filtered, dried over magnesium sulphate, filtered and concentrated. 2.3 g (100%) of (2-trifluoromethylpyrazolo[1,5-a]pyridin-3-yl)methanol are obtained in the form of a yellow solid.
Wird geladen…
