Reaktion #304407

Reaktionsgleichung

N2

2-ethyl-4-oxo-3,4-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

EtMgBr

BF3.Et2O

→

2,6-diethyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGstirred for 10 min at the same temperature
2. 2
   workup.STIRRINGto stir for 1.5 hours
3. 3
   workup.STIRRINGto stir at −40° C. for 2 hours
4. 4
   Sonstigequenched with saturated aqueous NH4Cl
5. 5
   Extraktionextracted with EtOAc
6. 6
   WaschenThe combined organic layers are washed with brine
7. 7
   Trocknendried over MgSO4
8. 8
   Filtrationfiltered
9. 9
   Einengenconcentrated under reduced pressure
10. 10
    Sonstigepurified by silica gel column chromatography (eluent: hexane/EtOAc=10/1)
11. 11
    Sonstigeseparated the cis and trans isomers of racemic 2,6-diethyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester (50 mg, 50%)

Vorschrift

To CuI (0.82 mmol, 156 mg) in a flask purged with N2 is added 1.00 M tetrahydrofuran solution of EtMgBr (0.82 mmol, 0.82 ml) at −78° C. After stirring the suspension for 30 min, BF3.Et2O (0.41 mmol, 57.9 mg) is added and stirred for 10 min at the same temperature. To the suspension is added tetrahydrofuran solution (3.3 mL) of 2-ethyl-4-oxo-3,4-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (0.41 mmol, 92.7 mg) at −78° C., then the mixture is allowed to stir for 1.5 hours and then allow to stir at −40° C. for 2 hours. The mixture is warmed to room temperature and quenched with saturated aqueous NH4Cl and extracted with EtOAc. The combined organic layers are washed with brine, dried over MgSO4, filtered, concentrated under reduced pressure, and purified by silica gel column chromatography (eluent: hexane/EtOAc=10/1) and separated the cis and trans isomers of racemic 2,6-diethyl-4-oxo-piperidine-1-carboxylic acid tert-butyl ester (50 mg, 50%); ESI-MS m/z: 200 [M-tBu+2]+, Retention time 3.51 min. (condition A).

Quelle