Reaktion #67792

Reaktionsgleichung

2-bromo-5-fluoropyridine

phenylmagnesium bromide

→

5-fluoro-2-phenylpyridine

Ausbeute 69.1%

Lösungsmittel

EtOAc

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe mixture was stirred overnight
2. 2
   Filtrationfiltered
3. 3
   EinengenThe filtrate was concentrated
4. 4
   Sonstigepurified by flash chromatography
5. 5
   Waschenby eluting with 2% EtOAc-Hexane

Vorschrift

To a solution of 2-bromo-5-fluoropyridine (10.0 g, 56.82 mmol, Aldrich) in tetrahydrofuran (100 ml) was added tetrakis(triphenylphosphine)Pd complex and stirred for 10 min. Then, phenylmagnesium bromide (68.2 ml, 1.00 M in THF, 68.19 mmol) was added drop-wise at 0° C. The mixture was stirred overnight. Then the reaction was diluted with EtOAc (600 ml), and filtered. The filtrate was concentrated and purified by flash chromatography by eluting with 2% EtOAc-Hexane to obtain 6.8 g (69%) of 5-fluoro-2-phenylpyridine.

Quelle