Cl[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([O:12][CH3:13])[CH:10]=2)[CH:5]=[C:4]([Cl:14])[N:3]=1.Cl.[Sn].[NH4+].[OH-]>C(O)(=O)C>[Cl:14][C:4]1[N:3]=[CH:2][C:11]2[C:6]([CH:5]=1)=[CH:7][CH:8]=[C:9]([O:12][CH3:13])[CH:10]=21,3-dichloro-7-methoxyisoquinoline (1.14 g, 5.00 mmol) was suspended in glacial acetic acid (6 mL) and concentrated HCl (2 mL), then treated with tin powder (1.77 g, 15.0 mmol) and stirred at 60° C. for 3 hours. The resulting mixture was basified to pH=9 with concentrated NH4OH and then extracted with ethyl acetate (10 mL×3). The combined organic layer was washed with saturated NaHCO3 solution (20 mL), dried over Na2SO4 and concentrated in vacuo, followed by silica gel column (EtOAc/PE=20:1) to give Intermediate 12 (200 mg, yield 21%) as a solid. 1H NMR (DMSO 300 MHz): δ 9.00 (s, 1H), 7.94 (s, 1H), 8.87 (d, J=9.0 Hz, 1H), 7.53 (d, J=2.7 Hz, 1H), 7.46 (dd, J=9.0, 2.7 Hz, 1H), 3.89 (s, 3H).
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