反应详情

温度

90 °C

In a round bottom flask under a nitrogen atmosphere N-dimethylaminomethylene-5-ethyl-6-methoxy-2-methyl-nicotinamide (synthesized on 0.567 mmol scale) of Step 2, Example 16 is treated with glacial acetic acid (1 mL) followed by methylhydrazine (50 μL, 0.94 mmol). The resulting mixture is stirred at 90° C. for 12 hr. The reaction mixture is evaporated to dryness and the residue is purified by flash chromatography on a 5-gram silica gel cartridge by elution with dichloromethane:methanol (49:1). Fractions containing the product are combined, evaporated and re-purified by flash chromatography on a 5-gram silica gel cartridge by elution with dichloromethane:methanol (99:1). Fractions containing the product are combined and the solvent evaporated to give 3-ethyl-2-methoxy-6-methyl-5-(2-methyl-2H-[1,2,4]triazol-3-yl)-pyridine (80 mg, 61% yield) as a light yellow oil. MS: m/e=233 (M+H); 1H NMR (δ, ppm): 7.96 (1H, s), 7.29 (1H, s), 3.99 (3H, s), 3.74 (3H, s), 2.59 (2H, q), 2.30 (3H, s), 1.19 (3H, t).

1. customThe reaction mixture is evaporated to dryness
2. customthe residue is purified by flash chromatography on a 5-gram silica gel cartridge by elution with dichloromethane:methanol (49:1)
3. additionFractions containing the product
4. customevaporated
5. customre-purified by flash chromatography on a 5-gram silica gel cartridge by elution with dichloromethane:methanol (99:1)
6. additionFractions containing the product
7. customthe solvent evaporated