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Rhodium catalyzed hydroformylation of kaurane derivatives: A route to new diter...
Peixoto, Andreia F.; Melo, Daniela S. de; Fernandes, Tânia F.; Fonseca, Yuraima; Gusevskaya, Elena V.; Silva, Artur M. S.; Contreras, Ricardo R.Kaurenic and grandiflorenic acids are naturally occurring diterpenes whose biological activity has been described. Both acids contain an exocyclic methylenic double bond that allows further functionalization on their structure. In an attempt to expand the number of derivatives of these two natural products, we have undertaken a study on the hydroformylation of the methyl esters of the two acids and the trimethy...
Organometallic catalysis: some contributions to organic synthesis
Gusevskaya,Elena V.In the present paper some general aspects of metal complex catalysis and its applications for oxyfunctionalization of various olefins, including naturally occurring ones, via selective oxidation, hydroformylation and alkoxycarbonylation are discussed.
Elucidation of the stereochemistry of diterpene derivatives obtained by palladi...
Gusevskaya,Elena V.; Silva,Marcio J. daThe structures of diterpene derivatives resulting from the palladium catalyzed tandem oxidative coupling-oxidation of camphene, i.e., bis(2,2-dimethyl-bicyclo[2.2.1]hept-3-ylidene)ethane and (4,4-dimethylbicyclo[3.2.1]oct-2-on-3-yl)(2,2-dimethylbicyclo[2.2.1]hept-3-ylidene)methane, were elucidated using one- and two-dimensional ¹H and13C NMR techniques. Their stereochemistry was determined unambiguously by NOES...
Palladium/Heteropoly Acid Catalyzed Oxidative Coupling of 2-Methoxy-1,4-benzoqu...
Oliveira,Rosilene A. de; Gusevskaya,Elena V.; Carazza,FernandoOxidative coupling of 2-methoxy-1,4-benzoquinone and arenes in acetic acid gives methoxyaryl-substituted 1,4-benzoquinones. The reaction is effectively catalyzed by a Pd(OAc)2/heteropoly acid (H9PMo6V6O40 ) redox system with dioxygen as the final oxidant.
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