2-Bromo-1,1-dimethoxyethane → 5-Methylimidazo(1,2-a)pyridin-6-amine

Temperatur

75 °C

2-Methyl-3-nitro-6-amino pyridine (63 mg, 0.41 mmol) was suspended in 1.3 mL EtOH containing 0.3 mL conc. HCl. 2-Bromo-1,1-dimethoxy-ethane (73 μL, 0.62 mmol) was added and the resulting mixture was refluxed for 8 h, at which point additional 2-bromo-1,1-dimethoxy-ethane (0.1 mL, 0.85 mmol) was added. The mixture was stirred at reflux overnight, cooled and diluted with CH2Cl2. The organics were washed with sat. NaHCO3 solution, dried over MgSO4 and concentrated in vacuo. The residue was dissolved in 4 mL AcOH/EtOAc (1:1) and the resulting solution was heated to 75° C. Iron powder (46 mg, 0.82 mmol, 325 Mesh) was added and the mixture was stirred for 20 min. Additional iron powder (46 mg, 0.82 mmol, 325 Mesh) was added and stirring was continued for 30 min. The mixture was cooled to room temperature and concentrated. The resulting residue was purified by silica gel silica gel flash chromatography with 20% MeOH in CH2Cl2 to give compound 843A (51 mg, 85%) as a yellow-brown solid. HPLC: 72% at 0.18 min and 28% at 0.27 min (retention time) (YMC S5 ODS-A column 4.6×50 mm Ballistic, 10-90% aqueous methanol over 4 mincontaining 0.2% H3PO4, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 147.85 [M+H]+.

1. additionwas added
2. temperatureat reflux overnight
3. temperaturecooled
4. washThe organics were washed with sat. NaHCO3 solution
5. dry with materialdried over MgSO4
6. concentrationconcentrated in vacuo
7. dissolutionThe residue was dissolved in 4 mL AcOH/EtOAc (1:1)
8. stirringthe mixture was stirred for 20 min
9. stirringstirring
10. temperatureThe mixture was cooled to room temperature
11. concentrationconcentrated
12. customThe resulting residue was purified by silica gel silica gel flash chromatography with 20% MeOH in CH2Cl2

ORD-Eintrag

ord-6a3e638ed04548cf9d1d0b0a587ae3fb

Quelldatensatz

uspto-grants-2008_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07470797B2