Mechanistic Studies and Improvement of Coinage Metal-Catalyzed Transformation of Alkynyloxiranes to Furans: An Alcohol Addition−Cyclization−Elimination Cascade
作者:Aurélien Blanc、Katharina Tenbrink、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo9008172
日期:2009.8.7
In the presence of alcohol Ag or Au salts or complexes catalyze the conversion of alkynyloxiranes to substituted furans. Both-catalysts are effective, and a large furan diversity can be obtained in high yield with one or the other catalyst. Mechanistic studies revealed that a cascade pathway and not the sometimes reported direct intra molecular nucleophilic addition of oxirane oxygen atom to intermediate acetylene-metal pi-complex occurs. Under the defined conditions, the intermediate formation of epoxide opening products has been identified. Depending on the catalyst, one or both of the latter cyclized to dihydrofurans, and further elimination of the alcohol led to the corresponding furans. These results highlight the duality between oxophilicity and alkynophilicity of Ag or Au salts.
First Evidence for the Use of Organosilver Compounds in Pd-Catalyzed Coupling Reactions; A Mechanistic Rationale for the Pd/Ag-Catalyzed Enyne Synthesis?
作者:Sandra Dillinger、Philippe Bertus、Patrick Pale
DOI:10.1021/ol015830b
日期:2001.5.1
[GRAPHICS]Silver acetylides have been prepared and used in Pd-catalyzed coupling reactions. Enynes have thus been obtained in good yields. This work demonstrates that organosilver compounds could enter the Pd catalytic cycle; it also supports the role of silver acetylides as intermediates in the new Pd/Ag-catalyzed coupling reaction.