C(=O)([O-])[O-].[K+].[K+].[CH3:7][O:8][C:9]([C:11]1[CH:15]=[CH:14][NH:13][CH:12]=1)=[O:10].Cl[C:17]1[CH:26]=[CH:25][C:24]2[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=2)[N:18]=1.O>CS(C)=O>[CH3:7][O:8][C:9]([C:11]1[CH:15]=[CH:14][N:13]([C:17]2[CH:26]=[CH:25][C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[N:18]=2)[CH:12]=1)=[O:10]1.73 g (12.5 mmol) of potassium carbonate are added at 20° C. under an argon atmosphere to 0.625 g (5 mmol) of 3-methoxycarbonyl-1H-pyrrole and 0.82 g (5 mmol) of 2-chloroquinoline dissolved in 10 mL of dimethyl sulphoxide. After stirring at 100° C. for 23 hours, the reaction mixture is poured into 30 mL of water and is then allowed to crystallise at 20° C. for 1 hour. After filtering off and air-drying the solid residue, 0.83 g of 3-methoxycarbonyl-1-(quinol-2-yl)-1H-pyrrole is obtained in the form of a beige-coloured solid melting at 136° C.
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