4-Aminobenzoic Acid → 4-(2-Oxopyrrolidin-1-yl)benzoic acid

Participants

Reaction Steps

19.2 g (140 mmol) 4-amino-benzoic acid are refluxed for 20 hours together with 25.8 ml (180 mmol) ethyl 4-bromobutyrate in 100 ml DMF. After evaporation i. vac. the residue is combined with 100 ml of water and 50 ml petroleum ether and vigorously stirred for 50 minutes. The precipitate is filtered off, recrystallised from ethanol and dried at 80° C.

Provenance & Evidence