反应详情

3,5-Dimethyl-4-(2-methoxycarbonylethyl)-1H-pyrrole-2-carboxylic acid ethyl ester (127 g) was dissolved in acetic acid (1900 mL), water (1900 mL) and tetrahydrofuran (1900 mL) and cooled to −30° C. Cerric ammonium nitrate (1097 g) was added in portions with stirring to give a reddish-orange suspension. The suspension was stirred at 0° C. for 2 hours, neutralized to pH 7 with sodium bicarbonate and extracted with ethyl acetate (2000 mL). The ethyl acetate layer was separated, washed with brine (200 mL) and dried over anhydrous sodium sulfate (20 g). The solvent was removed to give 80.2 g (60%) of 5-formyl-4-(2-methoxycarbonylethyl)-3-methyl-1H-pyrrole-2-carboxylic acid ethyl ester as an oil.

1. customto give a reddish-orange suspension
2. stirringThe suspension was stirred at 0° C. for 2 hours
3. extractionextracted with ethyl acetate (2000 mL)
4. customThe ethyl acetate layer was separated
5. washwashed with brine (200 mL)
6. dry with materialdried over anhydrous sodium sulfate (20 g)
7. customThe solvent was removed