Potassium peroxymonosulphate → Ethyl 2,3-dihydro-9-methanesulfinyl-1-benzoxepin-4-carboxylate

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Reaction Steps

A solution of potassium peroxymonosulfate (6.7 g) in water (33 ml) was added dropwise to a mixture of ethyl 2,3-dihydro-9-methylthio-1-benzoxepin-4-carboxylate (2.6 g) and tetrabutylammonium hydrogen sulfate (0.7 g) in ethyl acetate (26 ml) and water (13 ml) and the mixture was stirred at ambient temperature for 2.5 hours. The separated organic layer was washed with 10% aqueous sodium thiosulfate. The organic layer was washed with water, dried over magnesium sulfate and evaporated in vacuo. The residue was purified by column chromatography on silica gel using a mixture of ethyl acetate and toluene (1:1) as an eluent. The eluted fractions containing the desired product were collected and evaporated in vacuo to give ethyl 2,3-dihydro-9-methanesulfinyl-1-benzoxepin-4-carboxylate (0.65 g).

Provenance & Evidence