Maleic Anhydride → 1-(4-bromo-3-methylphenyl)-1H-pyrrole-2,5-dione

Participants

Reaction Conditions

Reaction Steps

4-Bromo-3-methylaniline (1.55 g, 8.33 mmol) and maleic anhydride (0.898 g, 9.16 mmol) were dissolved in acetic acid (10 mL) and heated at 115° C. for 12 h. The reaction was then cooled to 25° C. and the acetic acid was removed in vacuo. The resulting residue was suspended in 5% K2CO3 (100 mL), stirred for 25 minutes, filtered and rinsed with water. The material was then dried in vacuo to give 1.65 g (6.20 mmol, 74%) of compound 1B as a light brown solid. HPLC: 100% at 2.96 min (retention time) (YMC S5 ODS column 4.6×50 mm eluting with 10-90% aqueous methanol over 4 minutes containing 0.1% TFA, 4 mL/min, monitoring at 220 nm).

Provenance & Evidence