Reaktion #3393

Reaktionsgleichung

2-Chloro-5-nitropyridine

KF

acetonitrile

→

2-Fluoro-5-nitropyridine

Lösungsmittel

ether

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturheated
2. 2
   Temperaturat reflux until no starting material
3. 3
   Filtrationfiltered
4. 4
   Einengenconcentrated
5. 5
   SonstigeThe residue was triturated with hot hexane (5×1 L)
6. 6
   Einengenconcentrated
7. 7
   Sonstigeto afford 48 g (54%)

Vorschrift

2-Chloro-5-nitropyridine (100 g, 0.656 mol, Aldrich), KF (84.1 g, 1.448 mol), Ph4PBr (95.3 g, 0.227 mol) and acetonitrile (1.5 L) were combined and heated at reflux until no starting material remained. The volume was reduced to 750 mL, and the mixture was diluted with 2 L of ether, filtered and concentrated. The residue was triturated with hot hexane (5×1 L). The hexane extracts were combined and concentrated to afford 48 g (54%). 1H NMR (CDCl3, 300 MHz) δ7.15 (dd, J=3, 6 Hz, 1H), 8.64 (m, 1H), 9.15 (d, J=1.6 Hz, 1H).

Quelle