反应详情

The solution of 2-chloro-5-iodopyridine (2.0 g, 20.9 mmol), anhydrous hydrazine (3.3 mL, 105 mmol) in pyridine (40 mL) was heated at reflux overnight. After cooling to room temperature, the reaction mixture was concentrated under reduced pressure. To the residue was added 1 N sodium hydroxide solution and it was extracted with EtOAc. The organic layer was separated, dried (sodium sulfate) and concentrated under reduced pressure. To the residue was added hexanes, and the precipitate was collected and dried in vacuo to afford the title compound (1.35 g, 69% yield) as off-white crystals. MS (ES+, m/z): 236.2 (M++1).

1. temperatureat reflux overnight
2. concentrationthe reaction mixture was concentrated under reduced pressure
3. additionTo the residue was added 1 N sodium hydroxide solution and it
4. extractionwas extracted with EtOAc
5. customThe organic layer was separated
6. dry with materialdried (sodium sulfate)
7. concentrationconcentrated under reduced pressure
8. additionTo the residue was added hexanes
9. customthe precipitate was collected
10. customdried in vacuo