Acetic Acid → 2-[2-(Pyrrolidin-1-yl)ethylthio]methyl-3,5-dicarboethoxy-4-(m-nitrophenyl)-6-methyl-1,4-dihydropyridine

Beteiligte Stoffe

Reaktionsschritte

A solution of 2-(pyrrolidin-1-yl)-1-chloroethane hydrochloride (2.8 g), 2-mercaptomethyl-3,5-dicarboethoxy-4-(m-nitrophenyl) -6-methyl-1,4-dihydropyridine (5.4 g) and sodium ethoxide (2 g) in ethanol (70 ml) is heated to the reflux temperature for 6 hours, then it is neutralized with AcOH and evaporated under reduced pressure. The residue, after the usual work-up, is purified by column-chromatography (SiO2 ; 210 g; eluent AcOH/MeOH 99/1) to give 2.8 g of 2-[2-(pyrrolidin-1-yl)ethylthio]methyl-3,5-dicarboethoxy-4-(m-nitrophenyl) -6-methyl-1,4-dihydropyridine, as an oil, that upon treatment with fumaric acid gives the corresponding salt, m.p. 192°-194° C.

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