Dimethylformamide → 6-chloro-7-methylsulfanyl-8-nitro-9H-beta-carboline

Participants

Reaction Conditions

Reaction Steps

A 250 ml round-bottom flask with magnetic stirrer was charged with 6-chloro-7-fluoro-8-nitro-β-carboline (Intermediate 5, 3.959 g, 14.9 mmol) and 100 ml anhydrous DMF. The resulting orange mixture was cooled to 0° C. (ice and water bath) and sodium thiomethoxide (1.809 g, 25.8 mmol) in powder form was added slowly thereto. The reaction mixture was stirred for 1 hr at 0° C., warmed to RT, and added slowly to a stirring mixture of 4:1H2O/saturated aqueous sodium bicarbonate (500 ml). The precipitated solid was collected via suction filtration and air-dried to afford 4.017 g of 6-chloro-7-methylsulfanyl-8-nitro-9H-β-carboline as an orange powder. The crude material was used directly in subsequent steps. 1H-NMR (300 MHz, Methanol-d4): δ 8.91 (1H, d) 8.63 (1H, s) 8.42 (1H, d) 8.17 (1H, dd) 2.54 (3H, s). LCMS (formic acid standard method) retention time=1.43 min. MS (M+H+): 294.

Provenance & Evidence