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A solution of 6-methoxy-3-(pyrrolidin-1-yl)isoquinolin-1-ol (300 mg, 1.228 mmol) in POCl3 (8 mL) was refluxed for 4 h. After concentration, the residue was taken into a mixture of 100 mL of DCM and 50 mL of water, cooled to 0° C., neutralized with 3 N NaOH, dried over MgSO4, concentrated and purified via silica gel chromatography (5-20% EtOAc:Hex) to give 1-chloro-6-methoxy-3-(pyrrolidin-1-yl)isoquinoline (156 mg, 48.3% yield) as a yellow solid. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 7.95 (d, J=9.5 Hz, 1H), 6.85 (d, J=9.2 Hz, 1H), 6.80 (s, 1H), 6.43 (br. s., 1H), 3.89 (s, 3H), 3.56-3.49 (m, 4H), 2.08-2.03 (m, 4H); MS m/z 263.1 (M++1).

1. concentrationAfter concentration
2. additionthe residue was taken into a mixture of 100 mL of DCM and 50 mL of water
3. dry with materialdried over MgSO4
4. concentrationconcentrated
5. custompurified via silica gel chromatography (5-20% EtOAc:Hex)