反应详情

To a stirred solution of methyl 1,6-diaminopyridin-1-ium-3-carboxylate; 2,4,6-trimethylbenzenesulfonate (8 g, 21.68 mmol) in methanol (100 mL) is added 4-hydroxy-2,6-dimethyl-benzaldehyde (3.25 g, 21.68 mmol) and triethylamine (8.77 mL, 65.04 mmol) at 0° C. and the reaction mixture is stirred at room temperature for 48 hours. The reaction mixture is concentrated and extracted with EtOAc (100 mL). The combined organic extracts are washed with water (2×100 mL), saturated ammonium chloride solution (50 mL), brine solution (50 mL), and dried over anhydrous sodium sulphate, filtered, and evaporated to dryness. The crude material is purified by silica gel chromatography (combiflash 40 g redisep Rf column) and is eluted with 40-60% EtOAc in hexane to give the title compound as a pale yellow solid (1.2 g, 18%). LCMS m/z 298 [M+H]+.

1. concentrationThe reaction mixture is concentrated
2. extractionextracted with EtOAc (100 mL)
3. washThe combined organic extracts are washed with water (2×100 mL), saturated ammonium chloride solution (50 mL), brine solution (50 mL)
4. dry with materialdried over anhydrous sodium sulphate
5. filtrationfiltered
6. customevaporated to dryness
7. customThe crude material is purified by silica gel chromatography (combiflash 40 g redisep Rf column)
8. washis eluted with 40-60% EtOAc in hexane