[Cl:1][C:2]1[N:10]=[CH:9][CH:8]=[CH:7][C:3]=1[C:4](Cl)=[O:5].[Cl-].[Al+3].[Cl-].[Cl-].[CH3:15][C:16]1[NH:17][CH:18]=[C:19]([CH3:21])[CH:20]=1>ClCCl.C(OCC)(=O)C>[Cl:1][C:2]1[C:3]([C:4]([C:18]2[NH:17][C:16]([CH3:15])=[CH:20][C:19]=2[CH3:21])=[O:5])=[CH:7][CH:8]=[CH:9][N:10]=1
2-Chloronicotinoyl chloride (3.4 g, 20 mmol) (Aldrich, Milwaukee, Wis.) was added to a solution of aluminum chloride (2.7 g, 20 mmol) (Aldrich, Milwaukee, Wis.) in dichloromethane (100 mL) at 0° C., followed by a solution of 2,4-dimethylpyrrole (2.9 g, 30 mmol) in dichloromethane (20 mL). The mixture was then stirred at room temperature for one hour. The reaction was diluted with ethyl acetate, washed with brine, dried and concentrated. The residue was purified on a silica gel column to give 2.9 g (62%) of (2-chloro-pyridin-3-yl)-(3,5-dimethyl-1H-pyrrol-2-yl)-methanone.
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