Hydrazine hydrate (1:1) → (E)-(3,5-dibromo-4-pyridinyl)methylidenehydrazine
Reaktionsgleichung
[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Br:10])[C:7]=1[CH:8]=O.O.[NH2:12][NH2:13]>>[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Br:10])[C:7]=1/[CH:8]=[N:12]/[NH2:13]Komponenten
3
Reaktionsbedingungen
- Temperatur
- 120 °C
Versuchsvorschrift
In analogy to GP 1, 54 mg of 3,5-dibromo-pyridine-4-carbaldehyde (0.2 mmol, 1 eq; commercially available or prepared as described in U.S. Pat. No. 6,232,320 or WO2005110410) were dissolved in 1 mL 1-propyl alkohol, treated with 30 μL 80% hydrazine hydrate (0.61 mmol, 3 eq.) and heated to 120° C. for 30 min (employing a Biotage Initiator® microwave oven). The precipitate was filtered and washed with cold 1-propyl alkohol to yield 27 mg of the hydrazone (0.1 mmol, 50% yield).