反应详情

A solution of 2-chloro-5-(methylthio)benzoic acid (25 g, 123 mmol) dissolved in methanol (500 ml) was cooled to 0°-5° C. and then OXONE® (227.6 g, 370 mol) in water (500 ml) was added. The reaction mixture was stirred for 30 minutes at 0°-5° C. and then at room temperature for 4 hours. The reaction mixture was diluted with water, extracted with CHCl3 (3×200 ml) and the CHCl3 extracts were combined, washed with water, then brine and then were dried over MgSO4, filtered and evaporated to afford 5.13 g of 2-chloro-5-(methylsulfonyl)benzoic acid, m.p. 187°-188° C.

1. temperaturewas cooled to 0°-5° C.
2. waitat room temperature for 4 hours
3. extractionextracted with CHCl3 (3×200 ml)
4. washwashed with water
5. dry with materialbrine and then were dried over MgSO4
6. filtrationfiltered
7. customevaporated