A Convenient Access to the Piperidine Ring by Cyclization of Allylsilyl Substituted N- cyliminium and Iminium Ions: Application to the Synthesis of Piperidine Alkaloids.

This review relates a new access to the piperidine ring by intramolecular cyclization of acyl iminium and iminium ions substituted by an allylsilyl side chain as an internal Π-nucleophile. This methodology was applied to the synthesis of piperidine alkaloids Keywords: Piperidine, iminium ions, N-acyliminium ions, indolizidine, quinolizidine