Silver-Catalyzed Cyclization of Propargylic Amides to Oxazolines
作者:Valerie H. L. Wong、Andrew J. P. White、T. S. Andy Hor、King Kuok Mimi Hii
DOI:10.1002/adsc.201500610
日期:2015.12.14
is observed in the cyclization of propargylicamides catalyzed by bis(pyridyl)silver(I) complexes, with an unexpected reversal of electronic demand to the analogous NH addition reaction. The catalyst was found to be effective for internal alkyne substrates, offering exclusive selectivity for the 5-exo-dig product. Differences in selectivity profile between gold- and silver-catalyzed processes are highlighted
Organocatalytic Cyclization of COS and Propargylic Derivatives to Value‐Added Heterocyclic Compounds
作者:Hui Zhou、Rui Zhang、Sen Mu、Hui Zhang、Xiao‐Bing Lu
DOI:10.1002/cctc.201900490
日期:2019.12.5
and 1,3‐thiazolidine‐2,4‐diones derivatives in a highly chemo‐ and stereoselective manner. The isotope labeling and stoichiometric experiments suggested the LB‐COS adducts preferentially mediated basic ionic pair mechanism. Furthermore, the practical application of this methodology was highlighted by the highlyefficientsynthesis of rosiglitazone using COS as sulfur source.
Various substituted 1,3‐thiazolidin‐2‐ones can be synthesized by using a tBuOK‐mediated carbonylativecyclization of propargylicamines with elemental sulfur. Benzene‐1,3,5‐triyl triformate (TFBen) serves as a convenient CO surrogate.
Silver-catalyzed Three-component Reaction of Propargylic Amines, Carbon Dioxide, and <i>N</i>-Iodosuccinimide for Stereoselective Preparation of (<i>E</i>)-Iodovinyloxazolidinones
作者:Kohei Sekine、Ryo Kobayashi、Tohru Yamada
DOI:10.1246/cl.150584
日期:2015.10.5
The stereoselective synthesis of (E)-bromovinyloxazolidinones was developed by the three-component reaction of propargylic amines, carbondioxide, and N-bromosuccinimide in the presence of a silver...
Sonogashira Cross-Coupling Reactions
and Construction of the Indole Ring System Using a Robust, Silica-Supported
Palladium Catalyst
作者:Elizabeth Tyrrell、Leon Whiteman、Neil Williams
DOI:10.1055/s-0028-1083375
日期:——
The use of a recyclable silica-supported palladium catalyst in Sonogashira couplings and indole syntheses using a range of functionalised substrates is described. The catalyst is shown to be both robust and versatile, effecting the synthesis of 2-phenylindole in quantitative yield without the need for N-protection, a copper cocatalyst, a base, or a solvent.