Stereoselective synthesis and spectral studies of some benzotriazolylacetyl hydrazones of 3–alkyl–2,6–diarylpiperidin–4–ones.

An effort to include biologically potent benzotriazole nucleus into piperidine ring is achieved through hydrazone formation. The characterization of the synthesized compounds was carried out using FT-IR, 1 H & 13 C NMR, 1 H– 1 H COSY, 1 H– 13 C COSY, NOESY spectral techniques and GC-Mass spectrum. The spectral assignments were done without ambiguity using 2D-NMR techniques. The conformational preference of the piperidine ring deduced from the spectral studies is ‘chair’. The diastereotopic nature of the methylene protons/methyl groups present in the molecules is revealed clearly in their spectral pattern observed. [ABSTRACT FROM AUTHOR]