[C:1]1([C@@H:7]2[CH2:11][O:10][C:9](=[O:12])[NH:8]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Li]CCCC.[C:18](Cl)(=[O:22])[C:19]([CH3:21])=[CH2:20].O>C1COCC1>[C:18]([N:8]1[C@H:7]([C:1]2[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=2)[CH2:11][O:10][C:9]1=[O:12])(=[O:22])[C:19]([CH3:21])=[CH2:20]To a solution of (R)-4-phenyloxazolidin-2-one (65.00 g, 398.3 mmol) in dry THF (612.8 mL) at −78° C. was quickly added n-BuLi (167.3 mL, 418.3 mmol) dropwise, and the mixture was stirred at −78° C. for 0.5 hours. To this cold stirring solution was quickly added dropwise a solution of methacryloyl chloride (40.86 mL, 418.3 mmol) in THF (60 mL), and the mixture was allowed to warm to ambient temperature and stirred for 0.5 hours. Water (300 mL) was added and the suspension was stirred for 1 hour and then filtered to give desired product as a hard solid cake (66 g). The filtrate was concentrated under reduced pressure to a yellow solid residue, which was taken up in Et2O (400 mL) and filtered to give additional pure desired product (9 g). The products were combined to give (R)-3-methacryloyl-4-phenyloxazolidin-2-one (75 g, 81% yield).
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