[CH2:1]([N:3]1[CH2:15][CH2:14][C:6]2[NH:7][C:8]3[CH:9]=[CH:10][CH:11]=[CH:12][C:13]=3[C:5]=2[CH2:4]1)[CH3:2].C([C:18]1[CH:23]=[CH:22][N:21]=[CH:20][CH:19]=1)=C.[Na].FC(F)(F)C([O-])=O>C(O)C>[CH2:1]([N:3]1[CH2:15][CH2:14][C:6]2[N:7]([C:18]3[CH:23]=[CH:22][N:21]=[CH:20][CH:19]=3)[C:8]3[CH:9]=[CH:10][CH:11]=[CH:12][C:13]=3[C:5]=2[CH2:4]1)[CH3:2]The title compound was prepared according to General Method 3. 2-Ethyl-2,3,4,5-tetrahydro-5-(4-pyridyl)-1H-pyrido[4,3-b]indole was prepared from 2-ethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (See Example 5) (200 mg, 1 mmol), 4-vinylpyridine (0.26 mg, 2.5 mmol), and sodium (15 mg, 0.65 g atom) in ethanol (2 mL) at 150° C. overnight (16 h) to obtain 10 mg of 2-ethyl-2,3,4,5-tetrahydro-5-(4-pyridyl)-1H-pyrido[4,3-b]indole as a trifluoroacetate salt after purification on reverse-phase chromatography (C-18, 500 mm×50 mm, Mobile Phase A=0.05% TFA in water, B=0.05% TFA in acetonitrile, Gradient: 10% B to 80% B in 30 min, injection vol. 5 mL).
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