[CH3:1][O:2][C:3](=[O:14])[C:4](=[CH2:13])[CH:5](OC(=O)C)[CH2:6][CH2:7][CH3:8].[CH2:15]([O:22][NH2:23])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1>C1COCC1>[CH3:1][O:2][C:3](=[O:14])[C:4]([CH2:13][NH:23][O:22][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)=[CH:5][CH2:6][CH2:7][CH3:8]A mixture of 3-acetoxy-2-methylenehexanoic acid methyl ester (4.00 g, 20 mmol) and O-benzylhydroxylamine (7.39 g, 60 mmol) in THF (30 mL) is allowed to react at RT under N2 for 2 days. The reaction mixture is concentrated on Rotavap under reduced pressure (20 mbar) until no further solvent distills. The residue liquid is dissolved in ethyl acetate (75 mL) and washed with saturated aqueous sodium bicarbonate solution (50 mL). The ethyl acetate layer is concentrated on Rotavap under reduced pressure (20 mbar) until no further solvent distills to afford a colorless liquid (11.2 g).
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