Reaktion #52810

Reaktionsgleichung

sodium bicarbonate

3,5-Dimethyl-4-(2-methoxycarbonylethyl)-1H-pyrrole-2-carboxylic acid ethyl ester

water

ammonium nitrate

→

5-formyl-4-(2-methoxycarbonylethyl)-3-methyl-1H-pyrrole-2-carboxylic acid ethyl ester

Ausbeute 60.0%

Lösungsmittel

acetic acid

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeto give a reddish-orange suspension
2. 2
   workup.STIRRINGThe suspension was stirred at 0° C. for 2 hours
3. 3
   Extraktionextracted with ethyl acetate (2000 mL)
4. 4
   SonstigeThe ethyl acetate layer was separated
5. 5
   Waschenwashed with brine (200 mL)
6. 6
   Trocknendried over anhydrous sodium sulfate (20 g)
7. 7
   SonstigeThe solvent was removed

Vorschrift

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.

Quelle