Carbon Dioxide → 6-Chloro-2-methoxypyridine-3-carbaldehyde

Participants

Reaction Steps

To 2-Chloro-6-methoxypyridine (25, 0.511 g, 3.56 mmol) in tetrahydrofuran (10 mL) cooled in a −78° C. acetone/dry ice bath was added tert-butyllithium (1.7 M in pentane, 5.0 mL, 7.66 mmol). The reaction was allowed to stir for 1 hour. Dimethylformamide (0.673 mL, 17.4 mmol) was added and the reaction was allowed to continue for an additional 30 minutes at −78° C., then stirred for 30 minutes outside of the dry-ice bath. The reaction was placed back in the dry-ice bath and quenched with 6 N HCl (1.5 mL) followed by water and allowed to warm to room temperature. The reaction was extracted with diethyl ether and aqueous (1M) sodium bicarbonate. The organic layer was separated, dried with anhydrous magnesium sulfate, filtered and volatiles removed by rotary evaporation, and the resulting yellow solid was dried under vacuum to provide 561 mg of compound 26 (3.27 mmol, 92% yield). MS (ESI) [M+H+]+=172.0.

Provenance & Evidence