Carbon Dioxide → 4-Bromopyridine-3-carboxylic acid

Temperatur

-55 °C

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.

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

ORD-Eintrag

ord-b08931e80e184f09b7e12c4e6de10b4b

Quelldatensatz

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08530663B2