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.
Two Distinct Cyclizations of 2-Propenyl-1-ethynyl Benzenes with Aryldiazo Esters Using Au and Rh/Au Catalysts Respectively
作者:Sachin Bhausaheb Wagh、Yu-Chen Hsu、Rai-Shung Liu
DOI:10.1021/acscatal.6b02330
日期:2016.10.7
reports the development of two catalytic cyclizations of 2-propenyl-1-ethynylbenzenes with aryldiazo esters. Cationic gold catalyst produces 2-substituted 3-alkenyl-1H-indenes with substrates over a reasonable scope. Our mechanistic study suggests that arydiazo esters attack at the cyclopropyl moieties of gold carbene intermediates, followed by skeletalrearrangement of resulting intermediates. In the presence
Chiral Auxiliary Approach for Gold(I)‐Catalyzed Cyclizations
作者:Andrea Cataffo、Miguel Peña‐López、Riccardo Pedrazzani、Antonio M. Echavarren
DOI:10.1002/anie.202312874
日期:2023.12.4
The stereoselective gold(I)-catalyzed cascade cyclization of 1,5-enynes and alkoxycyclization of 1,6-enynes with chiral auxiliaries has been developed, affording, after hydrolysis, synthetically challenging enantioenriched ketones. This chiral auxiliary approach is an alternative to the use of complexchiral catalysts in gold(I)-catalyzed asymmetric cyclizations.
Enantioselective Alkoxycyclization of 1,6‐Enynes with Gold(I)‐Cavitands: Total Synthesis of Mafaicheenamine C
作者:Inmaculada Martín‐Torres、Gala Ogalla、Jin‐Ming Yang、Antonia Rinaldi、Antonio M. Echavarren
DOI:10.1002/anie.202017035
日期:2021.4.19
cyclization has been applied for the first totalsynthesis of carbazole alkaloid (+)‐mafaicheenamine C and its enantiomer, establishing its configuration as R. The cavity effect was also evaluated in the cycloisomerization of dienynes. A combination of experiments and theoretical studies demonstrates that the cavity of the gold(I) complexes forces the enynes to adopt constrained conformations, which results
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