Methyl acetoacetate → Dimethyl 4-[2(4-bromobutoxy)-5-methylsulfonylphenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

Participants

Reaction Steps

7.6 g of 2-(4-bromobutoxy)-5-methylsulfonylbenzaldehyde, 2.6 g of methyl acetoacetate and 2.9 g of 3-aminocrotonic acid methyl ester were dissolved in 16 ml of isopropanol, and the solution was heated for 5 hours. After cooling, precipitated crystals were collected by filtration, and recrystallized from methanol to give 6.3 g of dimethyl 4-[2(4-bromobutoxy)-5-methylsulfonylphenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate.

Provenance & Evidence