tert-Butyl 3,3-dimethyl-4-oxopiperidine-1-carboxylate → 4-(4-Chloro-phenyl)-4-hydroxy-3,3-dimethyl-piperidine-1-carboxylic acid tert-butyl ester
Reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11](=[O:14])[C:10]([CH3:16])([CH3:15])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[Cl:17][C:18]1[CH:23]=[CH:22][C:21]([Mg]Br)=[CH:20][CH:19]=1>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11]([C:21]2[CH:22]=[CH:23][C:18]([Cl:17])=[CH:19][CH:20]=2)([OH:14])[C:10]([CH3:16])([CH3:15])[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]Participants
4
Procedure
To an ice-cooled solution 3,3-Dimethyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester (1.6 g, 7.2 mmol) in THF (20 mL) was added 4-chlorophenyl magnesium bromide (1 M in ether, 15 mL, 15 mmol). The solution was allowed to warm to about room temperature, then stirred at room temperature for about 22 hours. The reaction was quenched with aqueous ammonium chloride and extracted with ethyl acetate. The combined organic layers were concentrated in vacuo, then purified by flash chromatography on silica gel (35 g SiO2, gradient elution from 100% hexane to 100% ethyl acetate) to yield the title compound as a colorless oil.
Workup
- temperatureto warm to about room temperature
- customThe reaction was quenched with aqueous ammonium chloride
- extractionextracted with ethyl acetate
- concentrationThe combined organic layers were concentrated in vacuo
- custompurified by flash chromatography on silica gel (35 g SiO2, gradient elution from 100% hexane to 100% ethyl acetate)
Sources & evidence
- ORD record
- ord-7da640ecdfa240cb96927de9b9421e56
- Source dataset
- uspto-grants-2011_11
- Patent number
- US08058287B2
Reaction notes
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