3-Nitrobenzaldehyde → 2,6-Dimethyl-3-methoxycarbonyl-4-(3-nitrophenyl)-5-(2-[4-(2,2-dimethyl-1,3-dioxolan-4-yl)methoxyphenyl]ethoxycarbonyl)-1,4-dihydropyridine

Participants

Reaction Steps

A solution of 13.2 g. (0.039 mol) of 4-(2,2-dimethyl-1,3-dioxolan-4-yl)methoxyphenylethylacetoacetate (5), 4.7 g (0.41 mol) of methyl β-aminocrotonate, and 6.2 g (0.41 mol) of 3-nitrobenzaldehyde in 80 mL of ethanol was heated at reflux for 12 h. Solvent was removed in vacuo and the residue purified by medium pressure chromatography on silica gel (80% ether-hexane) to give 21 g of 2,6-dimethyl-3-methoxycarbonyl-4-(3-nitrophenyl)-5-(2-[4-(2,2-dimethyl-1,3-dioxolan-4-yl)methoxyphenyl]ethoxycarbonyl)-1,4-dihydropyridine (6) as an orange oil.

Provenance & Evidence