2-(3-BROMOPYRIDIN-5-YL)PYRIDINE synthesis

Yield:-

Reaction Conditions:

with triphenylphosphine;tris-(dibenzylideneacetone)dipalladium⁽⁰⁾ in tetrahydrofuran;

Steps:

R.41.A Step A

Step A 3-Bromo-5-(2-pyridinyl)-pyridine 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)⁺.

References:

US2003/125267,2003,A1