Hydroxyamine hydrochloride → 2-Phenylpyrazolo[1,5-a]pyridine-3-carbaldehyde oxime hydrochloride
Reaction equation
[C:1]1([C:7]2[C:15]([CH:16]=O)=[C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][N:9]3[N:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[ClH:18].[NH2:19][OH:20]>C(O)C>[ClH:18].[C:1]1([C:7]2[C:15]([CH:16]=[N:19][OH:20])=[C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][N:9]3[N:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1Participants
4
Procedure
A mixture of 2-phenylpyrazolo[1,5-a]pyridine-3-carbaldehyde (0.5 g) and hydroxylamine hydrochloride (0.17 g) in ethanol (5 ml) was refluxed for 1.5 hours and evaporated in vacuo. The residue was triturated with ethyl acetate and recrystallized from a mixture of ethanol and ethyl acetate to give 2-phenylpyrazolo[1,5-a]pyridine-3-carbaldehyde oxime hydrochloride (0.28 g).