Phenylhydrazine hydrochloride → 3-tert-butyl-1-phenyl-1H-pyrazol-5-amine
Reaction equation
C(N(CC)C(C)C)(C)C.Cl.[C:11]1([NH:17][NH2:18])[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.[CH3:19][C:20]([CH3:27])([CH3:26])[C:21](=O)[CH2:22][C:23]#[N:24]>C(O)C>[C:20]([C:21]1[CH:22]=[C:23]([NH2:24])[N:17]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[N:18]=1)([CH3:27])([CH3:26])[CH3:19]Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
N,N-Diisopropylethylamine (1.7 mL, 7.99 mmol) was added to a mixture of phenyl hydrazine hydrochloride (1.5 g, 10.39 mmol) and 4,4-dimethyl-3-oxopentane nitrile (1.0 g, 7.99 mmol) in ethanol (15 mL) and the mixture was heated under reflux for 18 hours. The cooled mixture was then concentrated to low volume and partitioned between ethyl acetate and saturated sodium hydrogen carbonate solution. The organic layer was separated, dried over sodium sulfate and concentrated in vacuo. The residue was purified by column chromatography on silica gel, eluting with heptanes:ethyl acetate, 75:25, to afford the title compound as a pale orange oil that crystallised on standing (1.21 g, 70% yield).
Workup
- temperaturethe mixture was heated
- temperatureunder reflux for 18 hours
- concentrationThe cooled mixture was then concentrated to low volume
- custompartitioned between ethyl acetate and saturated sodium hydrogen carbonate solution
- customThe organic layer was separated
- dry with materialdried over sodium sulfate
- concentrationconcentrated in vacuo
- customThe residue was purified by column chromatography on silica gel
- washeluting with heptanes
Sources & evidence
- ORD record
- ord-111096eb09634e7ca3c8385e8e5bf841
- Source dataset
- uspto-grants-2009_03
- Patent number
- US07511057B2
Reaction notes
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