反应详情

To a solution of 8-bromo-2-chloroquinoline (14.3 g, 60 mmol) in toluene (90 mL) at −75° C. was added butyllithium in hexanes (2 mol/L, 30 mL) and the reaction mixture was kept for 20 min at −75° C. The reaction mixture was poured onto an excess of freshly crushed dry ice. Water was added (200 mL), and the aqueous layer was washed with ethyl acetate (3×100 mL), acidified to pH 1 with HCl (aq), and extracted with CH2Cl2 (3×100 mL). The combined organic layers were dried, and concentrated to afford 2-chloroquinoline-8-carboxylic acid as a white solid. Yield 6.56 g (53.6%).

1. washthe aqueous layer was washed with ethyl acetate (3×100 mL)
2. extractionextracted with CH2Cl2 (3×100 mL)
3. customThe combined organic layers were dried
4. concentrationconcentrated