Phosphorus oxychloride → 2-Chloroquinoline-4-carboxylic acid

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Reaktionsschritte

2-Hydroxyquinoline-4-carboxylic acid (34, 2.57 g, 13.6 mmol) and POCl3 (25 mL) were refluxed for 24 h. The reaction mixture was poured onto crushed-ice (300 g). The solid that separated was filtered, washed with water, and dried well under high vacuum afforded 2.47 g (87%) white flasks of desired product. 1H NMR (CDCl3, 300 MHz): δ 8.67 (d, 1H, J=8.4 Hz), 7.91 (d, 1H, J=8.1 Hz), 7.83 (s, 1H), 7.76 (t, 1H, J=7.2 Hz), 7.54 (t, 1H, J=7.2 Hz); LCMS (m/z): 208 (MH+).

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