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With tri-tert-butyl phosphine; palladium diacetate; sodium t-butanolate; In toluene; for 12h;Inert atmosphere; Reflux;
250mL reaction flask, <strong>[171408-84-7]2,7-dibromo-9,9'-spirobi[fluorene]</strong> 10.0g (21.09mmol), 11-phenyl-11,12-dihydroindolo[2,3-a]carbazole 7.71g (23.19mmol), palladium (II) acetate, 47mg (0.21mmol), tree tert-butylphosphine (50percent) 0.2mL (0.42mmol), sodium tert-butoxy 3.04g (31.63mmol) In a nitrogen stream, and and the mixture was stirred under reflux for 12 hours in 100mL of toluene. After completion of the reaction slowly cooled to room temperature and then the reaction solution was poured into a saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The filtered organic layer is separated, dried over anhydrous magnesium sulfate. The filtrate was concentrated under reduced pressure to give the separated purified by column chromatography intermediate compound as a white solid [1-1] 7.2g (47percent).