Boron trifluoride → 3-Methyl-5-oxooxolan-3-yl 2-methylprop-2-enoate

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[C:1]([O:6][CH2:7][C:8]1(C)[O:12][C:10](=[O:11])[CH2:9]1)(=[O:5])[C:2]([CH3:4])=[CH2:3].B(F)(F)F.[CH3:18]OC1C=CC(O)=CC=1>C(OCC)(=O)C>[C:1]([O:6][C:7]1([CH3:18])[CH2:8][O:12][C:10](=[O:11])[CH2:9]1)(=[O:5])[C:2]([CH3:4])=[CH2:3]

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실험 절차

In a 50 mL four-necked flask, 0.5 g of β-methacryloyloxymethyl-β-methyl-β-propiolactone was put, and dissolved in 10 g of ethyl acetate, and a stirrer, a thermometer and a Dimroth cooling tube were connected thereto. Then, 5 mol % of diethyl ether complex of boron trifluoride was added thereto based on the substrate, and 5 mg of p-methoxyphenol was added thereto, and while solution temperature was kept at 30° C., the resulting mixture was stirred. After the mixture was stirred for 2 hours, the resulting reaction mixture was washed with a 10% sodium carbonate aqueous solution and saturated brine, and dried over magnesium sulfate. After separation by filtration, the solvent was distilled off using an evaporator. Consequently, 0.42 g of crude β-methacryloyloxy-β-methyl-γ-butyrolactone represented by formula (8) was obtained, and a quantitative isomerization reaction was confirmed by HPLC and NMR.