反应详情

温度

-78 °C

To a solution of 3,5-dibromopyridine (5 g, 21.11 mmol) in THF was added LDA (2 M in THF, 12.66 ml, 25.33 mmol) at −78° C. The mixture was stirred at −78° C. for 45 min. Then ethyl carbonochloridate (2.29 g, 21.11 mmol) was added and the mixture stirred at −78° C. for 1 hours. After reaction completed, the reaction was quenched by addition of 5 mL of saturated NH4Cl and extracted with EtOAc. The extractions were combined, washed with H2O, dried over Na2SO4 and concentrated under vacuum. The residue was purified by flash column (Eluent: PE/EtOAc=10:1), to give ethyl 3,5-dibromoisonicotinate as a yellow solid. (1.9 g, yield 29%) LCMS (M+H+) m/z: calcd 306.8. found 309.7.

1. stirringthe mixture stirred at −78° C. for 1 hours
2. customAfter reaction
3. customthe reaction was quenched by addition of 5 mL of saturated NH4Cl
4. extractionextracted with EtOAc
5. extractionThe extractions
6. washwashed with H2O
7. dry with materialdried over Na2SO4
8. concentrationconcentrated under vacuum
9. customThe residue was purified by flash column (Eluent: PE/EtOAc=10:1)