Reaction #329744

Reaction equation

3,3-Dimethyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester

4-chlorophenylmagnesium bromide

→

title compound

4-(4-Chloro-phenyl)-4-hydroxy-3,3-dimethyl-piperidine-1-carboxylic acid tert-butyl ester

Solvents

THF

Conditions

Workup

1. 1
   Temperatureto warm to about room temperature
2. 2
   OtherThe reaction was quenched with aqueous ammonium chloride
3. 3
   Extractionextracted with ethyl acetate
4. 4
   ConcentrationThe combined organic layers were concentrated in vacuo
5. 5
   Otherpurified by flash chromatography on silica gel (35 g SiO2, gradient elution from 100% hexane to 100% ethyl acetate)

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-chlorophenylmagnesium 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.

Source