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
One-Pot Synthesis of 1,2-Dihydropyridines: Expanding the Diverse Reactivity of Propargyl Vinyl Ethers
作者:Tobias Harschneck、Stefan F. Kirsch
DOI:10.1021/jo102545m
日期:2011.4.1
The catalyzed synthesis of 1,2-dihydropyridines starting from easily accessible propargyl vinyl ethers was realized. The reaction sequence involving a transition metal-catalyzed propargyl-Claisen rearrangement, a condensation step, and a Brønsted acid-catalyzed heterocyclization furnishes the highly substituted heterocycles in moderate to excellent yields. Additionally, a practical one-pot protocol