Ethyl chloroformate → Ethyl 3,5-dibromoisonicotinate

Participants

Reaction Steps

To a solution of LDA (2 M solution in THF/heptane/ethylbenzene) (2.26 g, 10.54 mL, 21.06 mmol) in anhydrous THF (20 mL) under nitrogen atmosphere cooled to −78° C. was added a solution of the 3,5-dibromopyridine (5.0 g, 21.10 mmol) in anhydrous THF (40 mL) at −78° C. The reaction mixture was allowed to stir at the same temperature for 45 minutes. Then, a solution of chloro(ethoxy)methanone (22.90 g, 211.02 mmol) was added slowly over 15 minutes. After stirring for 20 minutes, the reaction mixture was quenched with saturated aqueous NaHCO3. The mixture was extracted with ethyl acetate (3×100 mL), and the combined organic layer was washed with water and brine. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was evaporated, and the residue was purified through CombiFlash using 0-10% ethyl acetate in hexane to provide ethyl 3,5-dibromopyridine-4-carboxylate as pale yellow oil (5.98 g, 92% yield); 1H NMR (400 MHz, DMSO-d6): δ1.43 (t, 3H), 4.49 (q, 2H), 8.67 (s, 2H); M+307.9.

Provenance & Evidence