반응 #56711

반응 방정식

oxazolidinone

n-butyllithium

oxalyl chloride

(R)-4-methyl-octanoic acid

CH2Cl2

→

titled compound

(4R, 5S)-4-Methyl-3-((R)-4-methyl-octanoyl)-5-phenyl-oxazolidin-2-one

용매

THF

—

hexanes

THF

반응 조건

후처리

1. 1
   기타resulting in vigorous gas evolution
2. 2
   농축concentrated
3. 3
   workup.ADDITIONwas added dropwise
4. 4
   workup.STIRRINGThe reaction was stirred 30 minutes at −78° C.
5. 5
   온도warmed directly to ambient temperature
6. 6
   기타quenched with sat. NH4Cl
7. 7
   기타The mixture was partitioned between Et2O and sat. NH4Cl (aq)
8. 8
   기타the phases were separated
9. 9
   건조the organic phase dried (MgSO4)
10. 10
    농축concentrated

실험 절차

To (R)-4-methyl-octanoic acid (2.14 g, 13.5 mmol) in 25 mL CH2Cl2 at 0° C. was added 3 drops DMF, followed by oxalyl chloride (1.42 mL, 16.2 mmol) resulting in vigorous gas evolution. The solution was warmed directly to ambient temperature, stirred 30 minutes, and concentrated. Meanwhile, to a solution of the oxazolidinone (2.64 g, 14.9 mmol) in 40 mL THF at −78° C. was added n-butyllithium (1.6 M soln in hexanes, 9.3 mL, 14.9 mmol) dropwise. The mixture was stirred for 10 minutes at which time the acid chloride in 10 mL THF was added dropwise. The reaction was stirred 30 minutes at −78° C., then warmed directly to ambient temperature and quenched with sat. NH4Cl. The mixture was partitioned between Et2O and sat. NH4Cl (aq), the phases were separated, and the organic phase dried (MgSO4), and concentrated to furnish 3.2 g of the titled compound as a colorless oil. LRMS: m/z 318.2 (M+).

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