Tetronamides as Latent Acyclic Vinylogous Amides in Formal <i>Aza</i>-[3 + 3] Cycloaddition Reactions with α,β-Unsaturated Iminium Salts. An Unexpected Rearrangement and an Approach to Synthesis of Substituted Piperidines
作者:Nadiya Sydorenko、Richard P. Hsung、Ossama Saleh Darwish、Juliet M. Hahn、Jia Liu
DOI:10.1021/jo049108d
日期:2004.10.1
A detailed account regarding formal aza-[3 + 3] cycloadditionreactions of tetronamides with α,β-unsaturated iminium salts is described here. This investigation uncovers regioisomeric cycloadducts that were not found in previous studies involving this formalcycloaddition and an unexpected rearrangement that led to pyridines and dihydropyridines. Both stereochemical and regiochemical issues raised