[N+:1]([C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[N:9]=[C:8]([CH3:13])[C:7]2([CH3:15])[CH3:14])([O-:3])=[O:2].[I:16][CH2:17][CH2:18][CH2:19][CH3:20]>>[I-:16].[CH2:17]([N+:9]1[C:10]2[C:6](=[CH:5][C:4]([N+:1]([O-:3])=[O:2])=[CH:12][CH:11]=2)[C:7]([CH3:15])([CH3:14])[C:8]=1[CH3:13])[CH2:18][CH2:19][CH3:20]5-Nitro-2,3,3-trimethylindole (250 mg, 1.22 mmol) and iodobutane (10 ml, 16.17 g, 87.87 mmol) were mixed and heated to reflux for 16hrs. The solvent was removed and the impure material stored at−20° C. for use in later reactions.
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