[H-].[Na+].[OH:3][C:4]([CH3:10])([CH3:9])[C:5]([O:7][CH3:8])=[O:6].Br[CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH:19]=[CH2:20]>CN(C)C=O>[CH3:9][C:4]([O:3][CH2:20][CH2:19][CH2:18][CH2:17][CH2:16][CH2:15][CH2:14][CH:13]=[CH2:12])([CH3:10])[C:5]([O:7][CH3:8])=[O:6]To 500 ml of dry N,N-dimethylformamide, 17 g of 60% sodium hydride was added, and 48 g of methyl 2-hydroxyisobutyrate was added dropwise with stirring under ice-cooling, and stirred for 10 minutes. Then, 100 g of 9-bromo-1-nonene (purity: 63.4%) was added, and the mixture was stirred for 15 hours at room temperature. The reaction solution was poured into ice-cold water, extracted with ethyl acetate, washed with brine, dried over anhydrous magnesium sulfate and concentrated. The residue was distilled under reduced pressure to give 29.9 g of the objective compound as yellowish oil.
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