[CH3:1][C:2]1[N:3]([C@H:8]2[CH2:12][C@@H:11]([C:13]([O:15][CH3:16])=[O:14])[CH:10]=[CH:9]2)[C:4]([CH3:7])=[CH:5][CH:6]=1.I[CH:18]([CH3:20])[CH3:19]>>[CH3:7][C:4]1[N:3]([C@H:8]2[CH2:12][C@@:11]([CH:18]([CH3:20])[CH3:19])([C:13]([O:15][CH3:16])=[O:14])[CH:10]=[CH:9]2)[C:2]([CH3:1])=[CH:6][CH:5]=1reacting said methyl (1R,4S)-4-(2,5-dimethyl-1H-pyrrol-1-yl)cyclopent-2-ene-1-carboxylate with 2-iodopropane to form methyl (1S,4S)-4-(2,5-dimethyl-1H-pyrrol-1-yl)-1-isopropylcyclopent-2-ene-1-carboxylate; and
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