Reaction equation
[O:1]=[C:2]1[NH:5][CH:4]([CH2:6][CH:7]=[CH:8][C:9]([O:11][CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[O:10])[CH2:3]1.C([O:23]O)(C)(C)C>C(O)(=O)C.[Na+].[Na+].Cl[Pd+2](Cl)(Cl)Cl>[O:23]=[C:7]([CH2:6][CH:4]1[CH2:3][C:2](=[O:1])[NH:5]1)[CH2:8][C:9]([O:11][CH2:12][C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1)=[O:10]Participants
Conditions
- Temperature
- 50 °C
Procedure
A mixture of benzyl 4-[(2RS)-4-oxoazetidin-2-yl]-but-2-enoate (167 mg), tert-butylhydroperoxide (0.3 ml), and sodium tetrachloropalladate (80 mg) in 67% aqueous acetic acid (2.7 ml) was heated at 50° C. for 8.5 hours. Additional tert-butylhydroperoxide (0.5 ml) and sodium tetrachloropalladate (40 mg) were added. The reaction mixture was stirred at room temperature for three days and heated at 50° C. for 14 hours. After evaporation of the solvent in vacuo, the residue was taken up into ethyl acetate (20 ml) and washed with dilute aqueous sodium chloride. Drying over magnesium sulfate and evaporation left an oil (200 mg), which was chromatographed on silica gel plate (developing solvent: 20% acetone in dichloromethane) afforded benzyl 3-oxo-4-[(2RS)-4-oxoazetidin-2-yl]butanoate (66 mg).
Workup
- temperatureheated at 50° C. for 14 hours
- customAfter evaporation of the solvent in vacuo
- washwashed with dilute aqueous sodium chloride
- dry with materialDrying over magnesium sulfate and evaporation
- waitleft an oil (200 mg), which
- customwas chromatographed on silica gel plate (developing solvent: 20% acetone in dichloromethane)
Sources & evidence
- ORD record
- ord-f87ea710f6b24e959a9829b34b7ae78b
- Source dataset
- uspto-grants-1985_09
- Patent number
- US04539152
Linked notes
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