Stereoselective 6π-Electron Electrocyclic Ring Closures of 2-Halo-Amidotrienes via a Remote 1,6-Asymmetric Induction
摘要:
A diastereoselective 6 pi-electrocyclic ring closure employing halogen-substituted 3-amidotrienes via a 1,6-remote asymmetric induction is described. This new asymmetric manifold for pericyclic ring closure further underscores the significance of the allenamide chemistry.
Torquoselective Ring Closures of Chiral Amido Trienes Derived from Allenamides. A Tandem Allene Isomerization−Pericyclic Ring-Closure−Intramolecular Diels−Alder Cycloaddition
作者:Ryuji Hayashi、John B. Feltenberger、Richard P. Hsung
DOI:10.1021/ol902821w
日期:2010.3.19
A new torquoselective ring-closure of chiral amide-substituted 1,3,5-hexatrienes and its application in tandem with [4 + 2] cycloaddition are described. The trienes were derived via either a 1,3-H or 1,3-H-1,7-H shift of alpha-substituted allenamides, and the entire sequence through the [4 + 2] cycloaddition could be in tandem from allenamides.