[CH:1]([C:4]1[C:13]2[C:8](=[C:9]([CH2:14]O)[CH:10]=[CH:11][CH:12]=2)[CH:7]=[CH:6][N:5]=1)([CH3:3])[CH3:2].P(Cl)(Cl)([Cl:18])=O.O.C(=O)([O-])[O-].[K+].[K+]>C(Cl)(Cl)Cl>[CH:1]([C:4]1[C:13]2[C:8](=[C:9]([CH2:14][Cl:18])[CH:10]=[CH:11][CH:12]=2)[CH:7]=[CH:6][N:5]=1)([CH3:3])[CH3:2]1-iso-Propyl-5-hydroxymethylisoquinoline (6.5 g) was dissolved in 50 ml of chloroform and 6.5 ml of phosphorus oxychloride was added dropwise under ice cooling. The mixture was stirred at room temperature for 1 hour. Water (50 ml) was added to the reaction mixture, and it was made weakly alkaline with potassium carbonate. The chloroform layer was washed in water, and dried. The solvent was distilled off under reduced pressure to afford 7.1 g of 1-isopropyl-5-chloromethylisoquinoline as a colorless oil.
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