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).