反应详情

温度

85 °C

2-Ethoxy-7-methoxy-8-methyl-quinolin-4-ol (1.0 g, 4.3 mmol) was dissolved in POCl3 (21 mL) under a nitrogen atmosphere. The reaction was heated to 85° C. for 1 h. The reaction was cooled to 0° C. and ice was added slowly. After 30 min, pH was adjusted to 6 with 1N NaOH(aq). The solution was extracted with ethyl acetate (2×50 mL). The organic layers were dried with sodium sulfate, filtered and were concentrated. 4-Chloro-2-ethoxy-7-methoxy-8-methyl-quinoline (875 mg, 81%) was purified by silica gel chromatography to afford a white solid.

1. temperatureThe reaction was cooled to 0° C.
2. additionice was added slowly
3. extractionThe solution was extracted with ethyl acetate (2×50 mL)
4. dry with materialThe organic layers were dried with sodium sulfate
5. filtrationfiltered
6. concentrationwere concentrated
7. custom4-Chloro-2-ethoxy-7-methoxy-8-methyl-quinoline (875 mg, 81%) was purified by silica gel chromatography
8. customto afford a white solid