Reaktion #78849

Reaktionsgleichung

3,5-dibromopyridine

PPh3

2-pyridinyl zinc chloride

→

title compound

3-Bromo-5-(2-pyridinyl)-pyridine

Lösungsmittel

THF

THF

EtOAc

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe resulting solution was warmed
2. 2
   Temperaturto reflux for 16 h
3. 3
   Waschenwashed with water (2×100 mL)
4. 4
   Trocknendried (MgSO4)
5. 5
   Filtrationfiltered
6. 6
   Einengenwas concentrated in vacuo
7. 7
   SonstigePurification by flash chromatography (EtOAc)

Vorschrift

A solution of 3,5-dibromopyridine (2.5 g, 10.5 mmol), PPh3 (210 mg, 0.8 mmol) in degassed THF (2 mL) was treated with Pd2(dba)3 (Tris(dibenzylideneacetone)dipalladium (0), 91.5 mg, 0.1 mmol) at 25° C. under N2. A solution of 2-pyridinyl zinc chloride (21 mL, 0.5 M in THF, Aldrich) in THF was added and the resulting solution was warmed to reflux for 16 h. The solution was allowed to cool to room temperature, diluted with EtOAc (200 mL), washed with water (2×100 mL), dried (MgSO4), filtered and was concentrated in vacuo. Purification by flash chromatography (EtOAc) afforded the title compound as a white solid. MS 236 (M+H)+.

Quelle