[Cl:1][C:2]1[CH:3]=[C:4]2[C:12](=[C:13]([N+:16]([O-:18])=[O:17])[C:14]=1F)[NH:11][C:10]1[CH:9]=[N:8][CH:7]=[CH:6][C:5]2=1.Cl.[CH3:20][N:21]([CH3:25])[CH2:22][CH2:23][SH:24].C([Li])CCC.O>CN(C=O)C>[Cl:1][C:2]1[CH:3]=[C:4]2[C:12](=[C:13]([N+:16]([O-:18])=[O:17])[C:14]=1[S:24][CH2:23][CH2:22][N:21]([CH3:25])[CH3:20])[NH:11][C:10]1[CH:9]=[N:8][CH:7]=[CH:6][C:5]2=1A 25 ml round-bottom flask with magnetic stirrer was charged with 6-chloro-7-fluoro-8-nitro-9H-β-carboline (98 mg, 0.37 mmol) in 2 ml of anhydrous DMF. A second 10 ml round-bottom flask with magnetic stirrer was charged with 2-dimethylamino-ethanethiol hydrochloride (100 mg, 0.70 mmol) in 2 ml anhydrous DMF. To the resulting suspension was added n-butyllithium (0.43 ml of 1.6 M solution in hexanes, 0.69 mmol) via syringe and the mixture was stirred for 5 min at RT. Next, the thioanion solution was added via syringe to 6-chloro-7-fluoro-8-nitro-9H-β-carboline, and the resulting red solution was stirred at RT for 30 min. The reaction mixture was slowly added to a 5:1 mixture of H2O/saturated aqueous sodium bicarbonate (30 ml) and allowed to sit at RT for several hours. The resulting precipitated solid was collected via suction filtration and air-dried to afford 109 mg of [2-(6-chloro-8-nitro-9H-β-carbolin-7-ylsulfanyl)-ethyl]-dimethyl-amine as an orange solid (83%).
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