[Cl-].[Al+3].[Cl-].[Cl-].[C:5](Cl)(=[O:8])[CH2:6][CH3:7].[CH3:10][N:11]1[CH:15]=[CH:14][CH:13]=[C:12]1[CH:16]=[O:17]>ClCCl>[CH3:10][N:11]1[CH:15]=[C:14]([C:5](=[O:8])[CH2:6][CH3:7])[CH:13]=[C:12]1[CH:16]=[O:17]To a suspension of aluminium chloride (22.9 g, 172 mmol) in anhydrous dichloromethane (100 ml) and propionylchloride (5.3 g, 57.3 mmol)was added a solution of 1-methyl pyrrole-2-carboxaldehyde (5 g, 46 mmol) in anhydrous dichloromethane (20 ml). The mixture was refluxed for 90 min, poured into ice and stirred until melted. The layers were separated and aqueous layer was extracted with dichloromethane (2×100 ml). The organic phase and extracts were combined, dried over sodium sulfate. The solvent was removed in vacuo to give the title compound (7.2 g, 95%), 1H NMR (d6-DMSO) d 9.6 (s, 1H), 7.9 (s, 1H), 7.4 (s, 1H), 3.9 (s, 3H), 2.8 (q, 2H), 1.06 (t, 3H).
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