Hydrazine → 5-Bromo-2-hydrazinopyridine

Participants

Reaction Steps

To 5-bromo-2-fluoropyridine (3-1) (46 g, 261 mmol) in THF (460 mL) was added hydrazine (41.9 g, 41.0 mL, 1.31 mol). The mixture was heated to reflux and stirred vigorously for 2 h. After cooling, the reaction mixture was diluted with water (200 mL) and extracted with EtOAc (3×500 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered, and concentrated in vacuo. The resulting crude product (3-2) was used in the subsequent step without further purification. LC/MS: m/z (M+H)=187.9.

Provenance & Evidence