Tuning Reactivity and Chemoselectivity in Electron Transfer Initiated Cyclization Reactions: Applications to Carbon−Carbon Bond Formation
作者:John R. Seiders、Lijun Wang、Paul E. Floreancig
DOI:10.1021/ja029139v
日期:2003.3.1
demonstrate that the scope of our electrontransfer initiated cyclization reaction can be significantly broadened by exploiting the relationship between the oxidation potentials of homobenzylic ethers and the mesolytic benzylic carbon-carbonbond dissociation energies of their radical cations. By lowering the oxidation potential of the electrophore and the benzylic carbon-carbonbond dissociation energy, we
Oxidative Cyclorelease from Soluble Polymeric Supports
作者:Hua Liu、Shuangyi Wan、Paul E. Floreancig
DOI:10.1021/jo0480951
日期:2005.5.1
Single electron oxidation is shown to be a viable method for effecting concomitant cyclization and cleavage (cyclorelease) of a series of polymer bound homobenzylic ethers. Soluble oligonorbornene polymers are stable toward redox chemistry and are isolable through precipitation with methanol, making them excellent supports for this process. These oxidative conditions are also shown to cleave secondary and tertiary alcohols and ethers in a new traceless approach to polymer-supported aldehyde and ketone synthesis.
US4555537A
申请人:——
公开号:US4555537A
公开(公告)日:1985-11-26
Structure−Reactivity Relationships in Oxidative Carbon−Carbon Bond Forming Reactions: A Mild and Efficient Approach to Stereoselective Syntheses of 2,6-Disubstituted Tetrahydropyrones
作者:Lijun Wang、John R. Seiders、Paul E. Floreancig
DOI:10.1021/ja046125b
日期:2004.10.1
Homobenzylic ethers with pendent enol acetate nucleophiles undergo highly efficient cleavage reactions followed by 6-endo cyclizations to form 2,6-disubstituted tetrahydropyrones with excellent stereocontrol at room temperature in the presence of the mild oxidant ceric ammonium nitrate. Cyclizations proceed through either stabilized or nonstabilized oxocarbeniumions. Structure-reactivity relationships