Hydrazine → HCID 178432644, Verbindung

Temperatur

85 °C

5-Bromo-6-methylpicolinamide (1 g, 4.65 mmol) and N,N-dimethylformamide dimethylacetal (20 mL) were combined in a 100 mL round-bottom flask with a stir bar and heated at 85° C. under a reflux condenser under nitrogen for 3 h. The resulting mixture was concentrated under reduced pressure and dried under vacuum to give yellow oil, which was used in the next step without purification. The residue was diluted with acetic acid (10 mL) and hydrazine (2.5 mL, 70.3 mmol) was added drop-wise and allowed to stir at room temperature for 5 h. The reaction mixture was poured into ice water. The resulting solid was filtered, washed with water and dried to give the desired product as a white solid. The aqueous filtrate was extracted with dichloromethane. The organic layer was concentrated under reduced pressure nearly to dryness to yield additional material. Combination of two batches gave the desired product (0.7 g, 2.9 mmol, 63% yield). MS (ESI) m/z 241.1 [M+2]+.

1. concentrationThe resulting mixture was concentrated under reduced pressure
2. customdried under vacuum
3. customto give yellow oil, which
4. customwas used in the next step without purification
5. additionwas added drop-wise
6. filtrationThe resulting solid was filtered
7. washwashed with water
8. customdried

ORD-Eintrag

ord-b2c59b70a39e47c09a0e458e6fd8a4aa

Quelldatensatz

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08907087B2