Potassium Hydroxide → 5-Hydrazinyl-2-methoxypyridine

Temperatur

0 °C

5-Amino-2-methoxypyridine (5.0 g, 40 mmol) was dissolved in 6 N HCl (10 mL), cooled to 0° C., and vigorously stirred throughout the procedure. Sodium nitrite (2.8 g, 41 mmol) was dissolved in water (10 mL) and this solution was added to the reaction solution. After 30 min, tin (II) chloride dihydrate (52 g, 230 mmol) in 6 N HCl (20 mL) was added, and the reaction slurry was stirred at 0° C. for 2.5 h. The pH was adjusted to 13 with 40% aqueous potassium hydroxide solution. Ethyl ether was added and the mixture was extracted with EtOAc (4×70 mL). dried (MgSO4) and concentrated to give 5-hydrazino-2-methoxypyridine as an orange solid (5.1 g).

1. additionthis solution was added to the reaction solution
2. stirringthe reaction slurry was stirred at 0° C. for 2.5 h
3. extractionthe mixture was extracted with EtOAc (4×70 mL)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated

ORD-Eintrag

ord-7e0285ffae7e47b599ddc8f4e12248f9

Quelldatensatz

uspto-grants-2002_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06358945B1