Sodium Methoxide → 3-Isopropyl 5-(1-benzhydryl-3-azetidinyl) 2-amino-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate

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Reaction Steps

1.6 g (0.0035 mole) of 1-benzhydryl-3-azetidinyl 2-(3-nitrobenzylidene)acetoacetate (prepared as described in Preparation 15) and 0.63 g (0.0035 mole) of isopropyl amidinoacetate hydrochloride were dissolved in 40 ml of isopropanol. 0.19 g (0.0035 mole) of sodium methoxide was then added to the mixture, and the mixture was heated under reflux for 4 hours. At the end of this time, the mixture was cooled, and the insoluble material was filtered off. The solvent was then distilled off under reduced pressure, and the residue was dissolved in ethyl acetate. The resulting solution was washed with water and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography, using a 4:1 by volume mixture of toluene and ethyl acetate as eluent, to give 1.15 g (yield 56%) of the title compound as pale yellow crystals, melting at 104°-107° C.

Provenance & Evidence