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In a vacuum dried flask under an argon atmosphere, a solution of (RS)-5-(3-bromo-phenyl)-5-methyl-morpholin-3-one (3.0 g, 11.1 mmol) in dichloromethane (145 ml) was treated with trimethyloxonium tetrafluoroborate (2.594 g, 17 mmol). The reaction mixture was stirred at room temperature for 17 hours. For the workup, the incomplete reaction was extracted with a saturated solution of sodium hydrogen carbonate (70 ml). The organic layer was dried over sodium sulphate and evaporated. There were obtained 3.12 g of the title compound as a light yellow oil containing about 17% of the starting lactam. Mass (calculated) C12H14BrNO2 [284.16]; (found) [M+H]+=284 and [M+H]+=286.

1. customIn a vacuum dried flask under an argon atmosphere
2. customFor the workup, the incomplete reaction
3. extractionwas extracted with a saturated solution of sodium hydrogen carbonate (70 ml)
4. dry with materialThe organic layer was dried over sodium sulphate
5. customevaporated