反应详情

温度

180 °C

A 20 mL microwave vial was charged with 2-[(4-bromo-phenylamino)methylene]malonic acid diethyl ester (1.711 g, 5.0 mmol) and POCl3 (phosphoryl chloride, 10.0 mL, 16.8 g, 109 mmol). The vial was capped and the mixture was microwave heated stepwise up to 180° C. (watching the pressure) over 5 min and then kept at 180° C. for 30 min Excess POCl3 was evaporated and the residue partitioned between CH2Cl2 (40 mL) and 2 N NaOH (aq) (40 mL). The aqueous layer was extracted with CH2Cl2 (2×40 mL). The organic layers were combined, dried with Na2CO3 and evaporated. The residue was purified on column (silica gel, CH2Cl2 as eluent). Pure fractions were pooled, evaporated and the residue dried under vacuum to give 0.821 g (52%) of 6-bromo-4-chloroquinoline-3-carboxylic acid ethyl ester. MS (ESI+) m/z 314, 316 (MH+).

1. customThe vial was capped
2. customover 5 min
3. customExcess POCl3 was evaporated
4. customthe residue partitioned between CH2Cl2 (40 mL) and 2 N NaOH (aq) (40 mL)
5. extractionThe aqueous layer was extracted with CH2Cl2 (2×40 mL)
6. dry with materialdried with Na2CO3
7. customevaporated
8. customThe residue was purified on column (silica gel, CH2Cl2 as eluent)
9. customevaporated
10. customthe residue dried under vacuum