Hydrochloric Acid → 5,6-Dimethoxy-1H-indazol-3-amine
Reaktionsgleichung
[NH2:1][C:2]1[C:7]([C:8]#[N:9])=[CH:6][C:5]([O:10][CH3:11])=[C:4]([O:12][CH3:13])[CH:3]=1.Cl.[N:15]([O-])=O.[Na+]>>[NH2:9][C:8]1[C:7]2[C:2](=[CH:3][C:4]([O:12][CH3:13])=[C:5]([O:10][CH3:11])[CH:6]=2)[NH:1][N:15]=1Komponenten
4
Versuchsvorschrift
To a solution of 6-aminoveratronitrile (39 g, 0.2 mole) and conc. hydrochloric acid (329 ml) was added a solution of sodium nitrite (17 g, 0.25 mole in minimum amt. of water). The temperature was held below 0° during the addition. Keeping the temperature between 0° to 20° the resulting solution was added dropwise to stannous chloride (33.3 g, 1.76 mole) and conc. hydrochloric acid (153 ml). The precipitate was filtered and air dried overnight. The filter cake was placed in water (1100 ml), refluxed for 20-30 min and then filtered. The filtrate was cooled and then treated with sodium hydroxide (10% - 290 ml) to precipitate a tan solid. This solid was air dried at 60° to yield 57 g of 3-amino-5,6-dimethoxyindazole.