Intramolecular Reactions of Alkynes with Furans and Electron Rich Arenes Catalyzed by PtCl<sub>2</sub>: The Role of Platinum Carbenes as Intermediates
作者:Belén Martín-Matute、Cristina Nevado、Diego J. Cárdenas、Antonio M. Echavarren
DOI:10.1021/ja029125p
日期:2003.5.1
On the basis of DFT calculations, a cyclopropyl platinacarbene complex was found as the key intermediate in the process. The cyclopropane and dihydrofuran rings of this intermediate open to form a carbonyl compound, which reacts with the platinum carbene to form an oxepin, which is in equilibrium with an arene oxide. When the reaction is carried out in the presence of water, dicarbonyl compounds are
In the presence of 5-10 mol% Cp*RuCI(cod), 1,6- and 1,7-diynes were allowed to react with an ethynylboronate at ambient temperature to give rise to bicyclic arylboronates in 64-93% isolated yields. 1,6-Diynes bearing a boronate terminal also underwent cycloaddition with monoalkynes to give the corresponding bicyclic arylboronates. (c) 2006 Elsevier Ltd. All rights reserved.
PtII-Catalyzed Intramolecular Reaction of Furans with Alkynes
作者:Belén Martín-Matute、Diego J. Cárdenas、Antonio M. Echavarren
A New Route to Substituted Phenols by Cationic Rhodium(I)/BINAP Complex-Catalyzed Decarboxylative [2 + 2 + 2] Cycloaddition
作者:Hiromi Hara、Masao Hirano、Ken Tanaka
DOI:10.1021/ol900123d
日期:2009.3.19
A new route to substituted phenols has been developed by cationic rhodium(I)/BINAP complex-catalyzed decarboxylative [2 + 2 + 2] cycloadditions of 1,6- and 1,7-diynes with commercially available vinylene carbonate.