[CH3:1][C:2]1([CH3:19])[O:18][CH:15]([CH:16]=[CH2:17])[CH:4]([CH:5]([O:9][CH:10]([O:12][CH2:13][CH3:14])[CH3:11])[CH2:6][CH:7]=O)[O:3]1.Cl.[NH2:21][OH:22]>N1C=CC=CC=1.CCOCC>[CH3:1][C:2]1([CH3:19])[O:18][CH:15]([CH:16]=[CH2:17])[CH:4]([CH:5]([O:9][CH:10]([O:12][CH2:13][CH3:14])[CH3:11])[CH2:6][CH:7]=[N:21][OH:22])[O:3]1The obtained 4,5-(dimethylmethylenedioxy)-3-(1-ethoxyethoxy)-6-heptenal was dissolved in 2 ml of pyridine under a nitrogen atmosphere, and 442 mg of hydroxylamine hydrochloride was added at 0° C. The mixture was stirred at room temperature for 4 hours, and the obtained reaction mixture was diluted with ether. The diluted reaction mixture was washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure to afford 1.00 g of 4,5-(dimethylmethylenedioxy)-3-(1-ethoxyethoxy)-6-heptenal oxime.
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