M. J. Fernández, J. M. Casares, E. Gálvez
May 1, 1993
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Journal
Journal of Heterocyclic Chemistry
Abstract
The methyl 2,6-diphenyl-1-methyl-4-oxopiperidine-3,5-dicarboxylates 1 were synthesized by the Mannich procedure from methyl 3-oxoglutarate, benzaldehyde and methylamine. Keto-enol tautomerism as well as configurational isomerism at C-2 were observed. The stereochemistry of the Ib and Ic enolic forms were determined by 1 H and 13 C nmr data