反应详情

温度

20.5 °C

To a 3 L flask, a solution of 1-(mercaptomethyl)cyclopropaneacetic acid (330.7 g) in methanol (1500 ml) was charged. 96% sulfuric acid (36 g) was added, and the reaction mixture was stirred for 5 h at 19-22° C. The reaction mixture was concentrated to ¼ of its volume at 50° C. under reduced pressure, and the residue was partitioned between water (1000 ml) and ethyl acetate (500 ml). The organic phase was separated, washed with 10% NaHCO3 and 5% NaCl (200 ml), and dried overnight over anhydrous sodium sulfate. The mixture was filtered and evaporated at 50° C. under reduced pressure, to afford 315.7 g of the crude 1-(mercaptomethyl)cyclopropaneacetic acid methyl ester, as a colored liquid with a strong, unpleasant odor.

1. concentrationThe reaction mixture was concentrated
2. customto ¼ of its volume at 50° C. under reduced pressure
3. customthe residue was partitioned between water (1000 ml) and ethyl acetate (500 ml)
4. customThe organic phase was separated
5. washwashed with 10% NaHCO3 and 5% NaCl (200 ml)
6. dry with materialdried overnight over anhydrous sodium sulfate
7. filtrationThe mixture was filtered
8. customevaporated at 50° C. under reduced pressure