反应详情

To a solution of dimethyl 2-methyl-4-(2-cyanophenyl)-6-dimethoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate (6.0 g) in acetone (60 mg) was added 6 N hydrochloric acid (6 ml), and the resultant mixture was stirred for 3 hours at room temperature. The reaction mixture was diluted with water (30 ml), and adjusted to pH 7.5 with an aqueous sodium bicarbonate solution, and acetone was distilled off under reduced pressure. The resultant crystalline mass was crushed as finely as possible with a glass rod, washed with an additional water (100 ml), collected by filtration, further washed thoroughly with water, and air-dried to give crystalline powder of dimethyl 2-methyl-4-(2-cyanophenyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate (5.19 g).

1. distillationwas distilled off under reduced pressure
2. customThe resultant crystalline mass was crushed as finely as possible with a glass rod
3. washwashed with an additional water (100 ml)
4. filtrationcollected by filtration
5. washfurther washed thoroughly with water
6. customair-dried