Tandem Diels−Alder <i>N</i>-Acyliminium Ion Cyclization Reactions. A New Entry into the Erythrinane Skeleton
作者:Albert Padwa、C. Oliver Kappe、Thomas S. Reger
DOI:10.1021/jo960818w
日期:1996.1.1
Studies Dealing with the Cycloaddition/Ring Opening/Elimination Sequence of 2-Amino-Substituted Isobenzofurans
作者:Albert Padwa、C. Oliver Kappe、John E. Cochran、James P. Snyder
DOI:10.1021/jo962358c
日期:1997.5.1
Pummerer reaction of an o-amido-substituted sulfoxide is intercepted by the adjacent amido carbonyl group to produce a 2-amino-substituted isobenzofuran as a transient intermediate. In the presence of an electron-deficient dienophile, the reactiveisobenzofuran undergoes a Diels-Alder cycloaddition followed by ring opening to furnish a vinylogous C-acyliminium ion that readily aromatizes. The one-pot