Pyridinium chloride → 2-Amino-5-nitropyridin-3-ol
Reaktionsgleichung
[NH2:1][C:2]1[C:7]([O:8]C)=[CH:6][C:5]([N+:10]([O-:12])=[O:11])=[CH:4][N:3]=1.Cl.N1C=CC=CC=1>>[NH2:1][C:2]1[C:7]([OH:8])=[CH:6][C:5]([N+:10]([O-:12])=[O:11])=[CH:4][N:3]=1Komponenten
3
Reaktionsbedingungen
- Temperatur
- 150 °C
Versuchsvorschrift
Into a 500 mL round bottom flask were combined 2-amino-3-methoxy-5-nitropyridine (0.300 g, 0.00177 mol) and solid pyridine hydrochloride (8.8 g, 0.076 mol). The solid mixture was heated at 150° C. upon which the solids fused (the evolution of a gas was also apparent). The mixture was held at 150° C. for three hours upon which reaction was deemed complete by LC-MS. After allowing to cool to 80° C., the mixture was poured on to ice and the aqueous layer was extracted with ethyl acetate (3×100 ml). The combined organic extracts were washed with water (2×100 mL), dried (Na2SO4), filtered and concentrated under vacuum to leave a crude residue. The residue was purified by column chromatography on silica gel using a methanol:methylene chloride (0-10%) gradient as eluent to give the product as a solid (0.138 g, 49%) which was used directly in the next step. LC-MS 1.28 min. m/z=155.9 (M+1).