Hydrazine → 3-Bromo-4-(4-chlorophenyl)-2-hydrazinyl-6-methylpyridine

Temperature

65 °C

To a suspension of 3-bromo-2-chloro-4-(4-chlorophenyl)-6-methylpyridine (0.18 g, 0.56 mmol) in dioxane (4 mL) at room temperature was added anhydrous hydrazine (0.4 mL). The resulting mixture was stirred at 65° C. for 1 h. Analysis by HPLC/MS indicated the reaction was not complete. Additional anhydrous hydrazine (0.3 mL) was added, and the reaction mixture was stirred at 65° C. for 4 h more. After cooling to room temperature, the reaction mixture was concentrated under reduced pressure. To the residue was added water, and the resulting suspension was sonicated for 5 min. The resulting slurry was filtered, and the collected solid was washed with water (10 mL×2), then dried in a 45° C. vacuum oven for 16 h to afford 160 mg (90%) of the title compound as a white solid. HPLC/MS: retention time=2.53 min, [M+H]+=312.1.

1. stirringthe reaction mixture was stirred at 65° C. for 4 h more
2. temperatureAfter cooling to room temperature
3. concentrationthe reaction mixture was concentrated under reduced pressure
4. additionTo the residue was added water
5. customthe resulting suspension was sonicated for 5 min
6. filtrationThe resulting slurry was filtered
7. washthe collected solid was washed with water (10 mL×2)
8. customdried in a 45° C. vacuum oven for 16 h

ORD record

ord-23b1b99cebaa499884ffe966d0dd30d9

Source dataset

uspto-grants-2009_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07572808B2