反应详情

12.3 g (79 mmol) of 1,1,3,3-tetramethoxypropane, 0.12 g (0.8 mmol) of 1-methyl-3-phenylurea, 9.6 g (79 mmol) of 4-acetylpyridine, 30 ml (500 mmol) of acetic acid and 39 g (500 mmol) of ammonium acetate were dissolved in 160 ml of 2-propanol, and the reaction solution was allowed to undergo the reaction at 80° C. for 9 hours. After completion of the reaction, this was cooled to room temperature, neutralized with 200 g (1.2 mol) of 25% sodium hydroxide aqueous solution and then extracted three times with 200 ml of toluene. The organic layer was concentrated and then purified by distillation under a reduced pressure to obtain 7.8 g (yield 63.2%) of the title compound (purity 99.2%, melting point 55-57° C.).

1. customthe reaction at 80° C. for 9 hours
2. customAfter completion of the reaction
3. extractionextracted three times with 200 ml of toluene
4. concentrationThe organic layer was concentrated
5. distillationpurified by distillation under a reduced pressure