4-Aminopyridine → 4-Phenyl-1-(4-pyridyl)-piperidin-2,6-dione

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Reaction Steps

The starting material is prepared as follows: The mixture of 19 g of 3-phenylglutaric anhydride, 10.3 g of 4-aminopyridine, 350 ml of xylene and 2.5 g of methane sulfonic acid is refluxed on a water separator while stirring for 2 days. The hot solution is decanted from some insolubles, cooled, filtered an the residue triturated with hot isopropanol, to yield the 4-phenyl-1-(4-pyridyl)-piperidin-2,6-dione meling at 229°-230°; the analogously prepared 4-(p-methoxyphenyl)-1-(4-pyridyl)-piperidine-2,6-dione melts at 168°-169°.

Provenance & Evidence