Silver‐Free Au(I) Catalysis Enabled by Bifunctional Urea‐ and Squaramide‐Phosphine Ligands via H‐Bonding
作者:Allegra Franchino、Àlex Martí、Stefano Nejrotti、Antonio M. Echavarren
DOI:10.1002/chem.202101751
日期:2021.8.16
A library of gold(I) chloride complexes with phosphine ligands incorporating pendant (thio)urea and squaramide H-bond donors was prepared with the aim of promoting chloride abstraction from Au(I) via H-bonding. In the absence of silver additives, complexes bearing squaramides and trifluoromethylated aromatic ureas displayed good catalytic activity in the cyclization of N-propargyl benzamides, as well
Intermolecular Gold-Catalyzed Diastereo- and Enantioselective [2+2+3] Cycloadditions of 1,6-Enynes with Nitrones
作者:Sagar Ashok Gawade、Sabyasachi Bhunia、Rai-Shung Liu
DOI:10.1002/anie.201203507
日期:2012.7.27
Going for gold: The title reaction has been developed and demonstrates a wide substrate scope with respect to the 1,6‐enynes and nitrones (see scheme; DCE=1,2‐dichloroethane, Tf=trifluoromethanesulfonyl). The results for the enantioselective versions are also presented.
Gold(I)-Catalyzed Cycloisomerization–Dimerization Cascade of Benzene-Tethered 1,6-Enynes
作者:Mónica Álvarez-Pérez、María Frutos、Alma Viso、Roberto Fernández de la Pradilla、María C. de la Torre、Miguel A. Sierra、Heinz Gornitzka、Catherine Hemmert
DOI:10.1021/acs.joc.7b01273
日期:2017.7.21
An unprecedented stereoselective domino reaction of 1,6-enynes with an aryl ring at C3–C4 in the presence of gold(I) catalysts at low temperature is described. This process involves a novel 5-exo-dig cycloisomerization–dimerization sequence to afford formal Diels–Alder adducts that undergo a smooth gold-catalyzed doublebond migration at room temperature. In addition, the first examples of the gold