[CH:1]([C:3]1[N:4]([C:8]2[CH:9]=[C:10]([CH:15]=[CH:16][CH:17]=2)[C:11]([O:13][CH3:14])=[O:12])[CH:5]=[CH:6][CH:7]=1)=O.C(O)(=O)[CH2:19][C:20]([OH:22])=[O:21].N1CCCCC1.Cl>O.N1C=CC=CC=1>[C:20](/[CH:19]=[CH:1]/[C:3]1[N:4]([C:8]2[CH:9]=[C:10]([CH:15]=[CH:16][CH:17]=2)[C:11]([O:13][CH3:14])=[O:12])[CH:5]=[CH:6][CH:7]=1)([OH:22])=[O:21]The mixture of methyl 3-(2-formylpyrrol-1-yl)benzoate (3.0 g), malonic acid (2.7 g), pyridine (30 ml) and piperidine (0.3 ml) was stirred for 3 hours at 90°-100° C. The reaction mixture was poured into water, and the mixture was adjusted to pH 1 with 6N-hydrochloric acid. The mixture was extracted with a mixture of ethyl acetate and tetrahydrofuran. The extract layer was washed with brine, dried over magnesium sulfate and evaporated in vacuo. The residue was recrystallized from ethanol to give methyl 3-[2-((E)-2-carboxyethenyl)pyrrol-1-yl)benzoate.
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