Sodium Sulfite → ethyl 2-[3-bromo-4-(cyclopropylsulfonyl)phenyl]-3-(tetrahydro-2H-pyran-4-yl)acrylate

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Reaction Steps

Ethyl 2-[3-bromo-4-(cyclopropylsulfanyl)phenyl]-3-(tetrahydro-2H-pyran-4-yl)acrylate (4.57 g) was dissolved in dichloromethane (91 mL), followed by ice-cooling. To this solution was added m-chloroperbenzoic acid (5.75 g) in 5 divided portions. It was warmed to room temperature, followed by stirring for 2 hours. To the reaction mixture was added a saturated aqueous sodium hydrogen carbonate solution, and further added a 1 M aqueous sodium sulfite solution. The organic layer was separated and the aqueous layer was then extracted with dichloromethane. The organic layer was further washed with a saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure to obtain ethyl 2-[3-bromo-4-(cyclopropylsulfonyl)phenyl]-3-(tetrahydro-2H-pyran-4-yl)acrylate (4.72 g) as an (E)/(Z)-mixture.

Provenance & Evidence