반응 #1519113

반응 방정식

methyl bromoacetate

N-hexanoyl-4-(S)-benzyloxazolidin-2-one

NaHMDS

→

methyl 3-(R)-(n-butyl)-3-[4-(S)-benzyloxazolidin-2-one-3-ylcarbonyl)propionate

용매

THF

THF

반응 조건

후처리

1. 1
   workup.STIRRINGthe resulting mixture is stirred at −78° C. for 1 hour
2. 2
   기타at rt
3. 3
   기타overnight
4. 4
   기타The reaction is quenched with NH4Cl
5. 5
   농축concentrated
6. 6
   세척washed with 0.5 N HCl and brine
7. 7
   기타dried
8. 8
   기타purified by silica gel chromatography (EtOAc/hexanes)

실험 절차

To a solution of N-hexanoyl-4-(S)-benzyloxazolidin-2-one A-2 (7.3 mmol) in THF at −78° C. is added 1.0 M NaHMDS (8.8 mmol) and the reaction stirred at −78° C. for 1 hour. A solution of methyl bromoacetate (8.8 mmol) in THF is then added dropwise, and the resulting mixture is stirred at −78° C. for 1 hour and then at rt overnight. The reaction is quenched with NH4Cl, concentrated, then suspended in EtOAc and washed with 0.5 N HCl and brine, dried and purified by silica gel chromatography (EtOAc/hexanes) to afford the methyl 3-(R)-(n-butyl)-3-[4-(S)-benzyloxazolidin-2-one-3-ylcarbonyl)propionate (A-3).

출처