CN(C)[CH:3]=[O:4].O=P(Cl)(Cl)Cl.[CH2:11]([N:18]1[C:30]2[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=2[C:24]2[C:19]1=[CH:20][CH:21]=[CH:22][CH:23]=2)[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>CCOC(C)=O>[CH2:11]([N:18]1[C:19]2[CH:20]=[CH:21][C:22]([CH:3]=[O:4])=[CH:23][C:24]=2[C:25]2[C:30]1=[CH:29][CH:28]=[CH:27][CH:26]=2)[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1A 50-mL 3-necked round-bottomed flask was charged with N,N-dimethylformamide (400 mg, 5.42 mmol, 2.80 equiv, 99%). To this, POCl3 (700 mg, 4.56 mmol, 2.40 equiv, 99%) was added drop wise with stirring at 0° C. and allowed to stir at room temperature for 1 hour. To this mixture was added 9-benzyl-9H-carbazole (500 mg, 1.93 mmol, 1.00 equiv, 99%) in small portions at 45° C. over 5 minutes. Then, the temperature was raised to 95° C. in an oil bath and allowed to stir for 18 hours. The progress was monitored by TLC (EtOAc:PE=1:4). Upon completion, the reaction mixture was cooled down to room temperature and quenched with water (20 mL). The resulting mixture was allowed to stir for an additional 4 hours at room temperature. The solids were collected by filtration and dried to afford 9-benzyl-9H-carbazole-3-carbaldehyde as green solid (200 mg, 36.1%). LCMS: [M+H]+: 286
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