Acetic Acid → Ethyl 1,4-dihydro-2,6-diisopropyl-4-(4-fluorophenyl)-5-phenyl-pyridine-3-carboxylate

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Reaction Steps

2.86 ml (50 mmol) of glacial acetic acid are added to 13.45 g (50 mmol) of the compound from Example 97 and 17.4 g (100 ml) of ethyl 3-amino-4-methyl-pent-2-enoate in 80 ml of ethylene glycol and the mixture is heated to reflux overnight. After cooling to room temperature, it is concentrated in vacuo and the residue is dissolved in dichloromethane and extracted several times using water. The organic phase is dried over magnesium sulphate and concentrated in vacuo, and the residue is taken up in ethyl acetate. After extracting using 10% strength hydrochloric acid, water and saturated sodium hydrogen carbonate solution, the organic phase is dried again and concentrated, and the residue is chromatographed on a column (silica gel 70-230 mesh, using ethyl acetate/petroleum ether)).

Provenance & Evidence