Gold(I)-Catalyzed Synthesis of Highly Substituted Furans
作者:Michael H. Suhre、Michael Reif、Stefan F. Kirsch
DOI:10.1021/ol0514101
日期:2005.9.1
triphenylphosphinegold(I) complexes are excellent catalysts for a cascade reaction of propargyl-Claisen rearrangement and heterocyclization to synthesize tri- and tetrasubstituted furans. Starting from easily accessed propargyl vinyl ethers, the furans are obtained in 72-99% yield. [reaction: see text]
Synthesis of Highly Substituted Pyrroles via a Multimetal-Catalyzed Rearrangement−Condensation−Cyclization Domino Approach
作者:Jörg T. Binder、Stefan F. Kirsch
DOI:10.1021/ol060664z
日期:2006.5.1
[reaction: see text] In a convenient one-pot process, easily accessedpropargyl vinyl ethers and aromatic amines are effectively converted into tetra- and pentasubstituted 5-methylpyrroles which can further be transformed into 5-formylpyrroles via IBX-mediated oxidation. The cascade reaction proceeds through a silver(I)-catalyzed propargyl-Claisen rearrangement, an amine condensation, and a gold(I)-catalyzed
Synthesis of Stable 2<i>H</i>-Pyran-5-carboxylates via a Catalyzed Propargyl-Claisen Rearrangement/Oxa-6π Electrocyclization Strategy
作者:Helge Menz、Stefan F. Kirsch
DOI:10.1021/ol061856x
日期:2006.10.1
[reaction: see text] The application of easily accessed propargyl vinyl ethers for the synthesis of monocyclic 2H-pyrans was achieved. Under the reaction conditions, highly substituted heterocycles were obtained in moderate to excellent yields. The one-pot sequence proceeds via a Ag(I)-catalyzed propargyl-Claisen rearrangement, followed by a base-catalyzed isomerization, and 6pi-oxaelectrocyclization