Reacción #69895

Ecuación de reacción

Carbon dioxide

Butyllithium

diisopropylamine

4-bromopyridine hydrochloride

→

4-bromonicotinic acid

Disolventes

THF

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.STIRRINGThe resulting solution was stirred for 2 hours
2. 2
   workup.STIRRINGThe resulting solution was stirred overnight at room temperature
3. 3
   OtroThe reaction was then quenched with water (100 mL)
4. 4
   ExtracciónThe resulting solution was extracted with EtOAc (3×200 mL)

Procedimiento

Butyllithium (82.0 mL, 205.6 mmol, 2.0 eq.) was added dropwise to a solution of diisopropylamine (20.8 g, 205.6 mmol, 2.0 eq.) in THF (100 mL) at −78° C., under nitrogen. The resulting solution was stirred for 1 hour at approximately −60 to −50° C. The resulting solution was added dropwise to a solution of 4-bromopyridine hydrochloride (20.0 g, 102.9 mmol, 1.0 eq.) in THF (100 mL) at −78° C. The resulting solution was stirred for 2 hours. Carbon dioxide gas was introduced into the reaction vessel for 30 minutes. The resulting solution was stirred overnight at room temperature. The reaction was then quenched with water (100 mL). The resulting solution was extracted with EtOAc (3×200 mL) and the aqueous layers were combined. The pH of the solution was adjusted to 3-4 with 1N HCl to yield 4-bromonicotinic acid (16.8 g) as a white solid. ES m/z: [M+H]+ 202.

Fuente