反应详情

温度

90 °C

To a solution of methyl 1,6-diaminopyridin-1-ium-3-carboxylate; 2,4,6-trimethylbenzenesulfonate (6.0 g, 16.3 mmol) in 1,4-dioxane (50 mL) is added 2,6-dimethylbenzaldehyde (1.72 g, 13.00 mmol) and the reaction mixture is heated at 90° C. for 2 hours. The reaction mixture is cooled to room temperature, 1 N KOH solution (15 mL) is added, and the mixture is stirred overnight at room temperature. The reaction mixture is diluted with water (50 mL) and extracted with EtOAc (2×100 mL). The combined organic extracts are washed with water (100 mL) and saturated brine solution (100 mL), dried over sodium sulphate, filtered, and concentrated. The crude material is purified by silica gel chromatography (combiflash) eluting with 12% EtOAc in hexanes to give the title compound as a yellow liquid (0.35 g, 16%). LCMS m/z 282 (M+H)+.

1. temperatureThe reaction mixture is cooled to room temperature
2. extractionextracted with EtOAc (2×100 mL)
3. washThe combined organic extracts are washed with water (100 mL) and saturated brine solution (100 mL)
4. dry with materialdried over sodium sulphate
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude material is purified by silica gel chromatography (combiflash)
8. washeluting with 12% EtOAc in hexanes