Torquoselective Ring Closures of Chiral Amido Trienes Derived from Allenamides. A Tandem Allene Isomerization−Pericyclic Ring-Closure−Intramolecular Diels−Alder Cycloaddition
摘要:
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.
Regio- and Stereoselective Isomerizations of Allenamides: Synthesis of 2-Amido-Dienes and Their Tandem Isomerization-Electrocyclic Ring-Closure
作者:Ryuji Hayashi、Richard P. Hsung、John B. Feltenberger、Andrew G. Lohse
DOI:10.1021/ol900647s
日期:2009.5.21
A regio- and stereoselectiveisomerization of allenamides is described, leading to preparations of de novo 2-amido-dienes and a tandem isomerization-6π-electron electrocyclic ring-closure.