[CH:1]1[CH:2]=[CH:3][C:4]2[NH:13][C:12]3[CH:11]=[N:10][CH:9]=[CH:8][C:7]=3[C:5]=2[CH:6]=1.Cl.[Cl:15]N1C(=O)CCC1=O.C([O-])([O-])=O.[K+].[K+]>O>[Cl:15][C:2]1[CH:3]=[C:4]2[C:5]([C:7]3[CH:8]=[CH:9][N:10]=[CH:11][C:12]=3[NH:13]2)=[CH:6][CH:1]=1To a solution of norharmane (2.0 g, 11.9 mmol) in water (89 ml) and 1M aqueous HCl (29.8 ml, 29.8 mmol) was added N-chlorosuccinimide (3.17 g, 23.8 mmol) portionwise. The resulting solution was stirred at RT for 6 h, and then at 0° C. to 5° C. for 12 h. The reaction was diluted with water (100 ml) and basified cautiously with solid K2CO3 (4.3 g). After stirring at RT for 1 h, the product was collected and washed with water. The crude product was refluxed in chloroform for 1 h and filtered after cooling to 15° C. to provide 2.05 g of 7-chloro-β-carboline.
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