Hydrochloric Acid → Dimethyl 4-[2-[4-(methanesulfonylamino)butoxy]-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

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Reaction Steps

In 4 ml of methylene chloride was dissolved 0.43 g of dimethyl 4-[2-(4-aminobutoxy)-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate. After 0.138 ml of triethylamine and 0.077 ml of methanesulfonyl chloride were added to the solution under ice cooling, the mixture was stirred for 3 days at room temperature. To the reaction solution were added 50 ml of ethyl acetate and 20 ml of 2N hydrochloride to fractionate the organic phase. The solvent was removed by distillation under reduced pressure. The obtained residue was subjected to silica gel column chromatography and eluted by chloroform:methanol (9:1 v/v). The obtained crude crystals were recrystallized from chloroform-n-hexane to give 0.31 g of dimethyl 4-[2-[4-(methanesulfonylamino)butoxy]-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate. This compound has the following physicochemical properties.

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