[CH3:1][N:2]1[CH2:15][CH2:14][C:5]2[NH:6][C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]=2[CH2:3]1.Br[C:17]1[CH:18]=[C:19]2[C:24](=[CH:25][CH:26]=1)[N:23]=[CH:22][CH:21]=[CH:20]2.[O-]P([O-])([O-])=O.[K+].[K+].[K+].N1CCC[C@H]1C(O)=O>CN(C=O)C.O.[Cu]I>[CH3:1][N:2]1[CH2:15][CH2:14][C:5]2[N:6]([C:17]3[CH:18]=[C:19]4[C:24](=[CH:25][CH:26]=3)[N:23]=[CH:22][CH:21]=[CH:20]4)[C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]=2[CH2:3]1A solution of 2,8-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (0.1 g, 0.5 mmol), 6-bromoquinoline (0.135 mL, 1 mmol), K3PO4 (0.318 g, 1.5 mmol), CuI (9.5 mg, 0.05 mmol) and L-Proline (11.5 mg, 0.1 mmol) in dry DMF (5 mL) was stirred at 150° C. for 24 h. The reaction mixture was diluted with water and extracted with EtOAc. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford crude material, which was purified by reverse phase HPLC to yield 2,8-dimethyl-5-quinolin-6-yl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole as an off white solid (8 mg). 1H NMR (Oxalate salt, CD3OD) d (ppm): 8.92 (d, 1H), 8.43 (d, 1H), 8.2 (dd, 1H), 8.0 (d, 1H), 7.8 (d, 1H), 7.6 (dd, 1H), 7.38 (d, 1H), 7.18 (d, 1H), 7.0 (dd, 1H), 4.42 (s, 2H), 3.5 (m, 2H), 3.1 (m, 5H), 2.4 (s, 3H).
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