C[O:2][C:3]1[CH:8]=[C:7]([CH2:9][CH2:10][C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][N:12]=2)[CH:6]=[CH:5][N:4]=1>Cl>[N:12]1[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=1[CH2:10][CH2:9][C:7]1[CH:6]=[CH:5][NH:4][C:3](=[O:2])[CH:8]=12-Methoxy-4-(2-(pyridin-2-yl)ethyl)pyridine (200 mg, 0.93 mmol) was stirred in concentrated hydrochloric acid (5 mL) at 120° C. for 18 h and then concentrated. The residue was dissolved in MeOH (5 mL) and passed down an Isolute SCX-2 column (10 g). Elution with 7 N NH3 in MeOH and concentration of the eluent provided the title compound (180 mg, 96%) as a white solid: 1H NMR (500 MHz, CD3OD) δ 8.45 (d, J=4.7 Hz, 1H), 7.75-7.71 (dd, J=7.8, 1.8 Hz, 1H), 7.32 (d, J=6.9 Hz, 1H), 7.28 (d, J=7.8 Hz, 1H), 7.27-7.23 (dd, J=7.8, 5.1 Hz, 1H), 6.34-6.29 (m, 2H), 3.08 (t, J=7.3 Hz, 2H), 2.92 (t, J=7.9 Hz, 2H).
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