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With caesium carbonate; In N,N-dimethyl-formamide; at 130℃; for 3h;Inert atmosphere;
In an argon atmosphere,Add 25-1 (10.0g, 0.050mol) into a 500mL three-necked flask,7H-Dibenzocarbazole (13.4g, 0.050 mol) and cesium carbonate (57.5g, 0.13mol),Take 230mL of N,N-dimethylformamide (DMF) into the bottle,Warm up to 130C, stir and react for 3 hours,After cooling to room temperature, the reaction solution was added to 400 mL of saturated brine to settle,Filter, vacuum dry,The obtained solid was separated by a silica gel column to obtain product 28-1 (14.8 g, yield: 66%).