反应详情

温度

7.5 °C

The procedure described in J. Org. Chem., 2004, 69 (6), pp 1959-1966 was used. Into a 20 l 4-necked round-bottom flask was placed 2-aminopyridine-3-carbaldehyde (1000 g, 8.19 mol), 1,1-dimethoxypropan-2-one (1257 g, 10.64 mol), ethanol (10 l), and water (2 l). This was followed by the addition of a solution of sodium hydroxide (409.8 g, 10.24 mol) in water (1000 ml) drop wise with stirring at 0-15° C. The solution was stirred for 3 h at 0-20° C. and then concentrated under vacuum. The resulting solution was extracted with 3×1200 ml of ethyl acetate and the organic layers were combined. The mixture was dried over sodium sulfate and concentrated under vacuum. The residue was washed with 3×300 ml of hexane and the solid was collected by filtration. This resulted in the title compound as a yellow solid. 1H-NMR (400 MHz, DMSO-d6) δ 9.11 (dd, 1H), 8.53 (d, 1H), 8.50 (dd, 1H), 7.73 (d, 1H), 7.67 (dd, 1H), 5.44 (s, 1H), 3.41 (s, 6H).

1. customInto a 20 l 4-necked round-bottom flask was placed
2. stirringThe solution was stirred for 3 h at 0-20° C.
3. concentrationconcentrated under vacuum
4. extractionThe resulting solution was extracted with 3×1200 ml of ethyl acetate
5. dry with materialThe mixture was dried over sodium sulfate
6. concentrationconcentrated under vacuum
7. washThe residue was washed with 3×300 ml of hexane
8. filtrationthe solid was collected by filtration