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0 °C

A mixture of 2-(3-chloro-4-methylsulfanyl-phenyl)-3-cyclopentyl-propionic acid (4.14 g, 13.85 mmol) in formic acid (7.08 mL) was cooled to 0° C. and then treated with a 30% aqueous hydrogen peroxide solution (7.85 mL). Tetrahydrofuran (4 mL) was added to help solubilize the starting material. The resulting reaction mixture was allowed to warm to 25° C. where it was stirred at this temperature overnight. The reaction mixture was then cooled to 0° C. and slowly treated with a saturated aqueous sodium sulfite solution. The product was extracted into ethyl acetate (3×20 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to afford 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (4.54 g, 99.1%) as a white solid: mp 123.9-126.2° C.; FAB-HRMS m/e calcd for C15H19ClO4S (M+H)+331.0771, found 331.0776.

1. customThe resulting reaction mixture
2. temperatureto warm to 25° C. where it
3. temperatureThe reaction mixture was then cooled to 0° C.
4. extractionThe product was extracted into ethyl acetate (3×20 mL)
5. dry with materialThe combined organic layers were dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo