[CH3:1][O:2][C:3]1[CH:8]=[C:7]([CH2:9][CH2:10][C:11]2[C:20]3[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=3)[C:14](=O)[NH:13][CH:12]=2)[CH:6]=[CH:5][N:4]=1.P(Cl)(Cl)([Cl:24])=O.Cl.O.N>C(#N)C.O1CCOCC1.CCOC(C)=O>[Cl:24][C:14]1[C:15]2[C:20](=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:11]([CH2:10][CH2:9][C:7]2[CH:6]=[CH:5][N:4]=[C:3]([O:2][CH3:1])[CH:8]=2)=[CH:12][N:13]=1Under a N2 atmosphere, 160 mg (0.57 mmol) of 4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-2H-isoquinolin-1-one in 3.7 ml of acetonitrile are mixed with 131 μl (1.43 mmol) of phosphorus oxychloride and 0.28 ml of 4 N HCl in dioxane and stirred for 7 h at 65° C. After cooling to RT, water/NH3 conc. 10:1 and EtOAc are added, the water phase is separated and extraction effected twice with EtOAc. The organic phases are washed with water and brine, dried (Na2SO4) and concentrated by evaporation to form 1-chloro-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-isoquinoline; 1H NMR (DMSO-d6) δ8.30 (d, 1H), 8.27 (d, 1H), 8.13 (s, 1H), 8.03 (d, 1H), 7.94 (t, 1H), 7.85 (t, 1H), 6.90 (d, 1H), 6.73 (s, 1H), 3.80 (s, H3C), 3.32 (t, H2C), 2.95 (t, H2C).
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