反应详情

To a solution of diethyl 2-methyl-4-(2-nitrophenyl)-6-diethoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate (1.1563 g) in acetone (10 ml) was added 6 N-hydrochloric acid (2.5 ml) and stirred at room temperature for 30 minutes. After removing acetone, water was added to the residue and neutralized with aqueous solution of sodium bicarbonate. The precipitated solid was collected by filtration, washed with water and then dried to give yellowish powder of diethyl 2-methyl-4-(2-nitrophenyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate (0.9407 g). The product was recrystallized from a mixture of ethanol and n-hexane to give the pure product, m.p. 101° to 103° C.

1. customAfter removing acetone, water
2. additionwas added to the residue
3. filtrationThe precipitated solid was collected by filtration
4. washwashed with water
5. customdried