3-Methylquinoline → 3-methylquinoline-8-sulfonyl Chloride

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The title compound was prepared according to the procedure of U.S. Pat. No. 5,332,822. To 9 mL (135 mmol) of chlorosulfonic acid at 0° C. was added slowly 3-methylquinoline (5.2 g, 36 mmol). The bath was removed and stirring was continued at 100° C. overnight. The reaction mixture was cooled to ambient temperature and then treated with 3.3 mL (45 mmol) of thionyl chloride. The reaction mixture was heated at 70° C. for 1 h, cooled to 0° C. and carefully quenched with ice (very vigorous reaction). The reaction mixture was diluted with 100 mL of water and extracted into dichloromethane (100 mL). The organic phase was washed with water, dried (MgSO4) and concentrated. The residue was triturated with dichloromethane/diethyl ether to provide 1.58 g (18%) of the title compound as a tan solid. 1H-NMR (300 MHz, DMSO-d6) δ9.17-9.29 (m, 2H), 8.32-8.38 (m, 2H), 7.96 (dd, 1H, J=7 Hz), and 2.51 (t, 3H, J=2 Hz).

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