Facile Stereoselective Approach to Diverse Spiroheterocyclic Tetrahydropyrans: Concise Synthesis of (+)‐Broussonetine G and H
作者:Li Zhou、Shu‐Yang Yu、Yong Tang、Lijia Wang
DOI:10.1002/anie.201907353
日期:2019.10.14
exocyclic enol ethers/enamines with methylene malonate and aldehydes has been developed to furnish spiroheterocyclic tetrahydropyrans in high yields with greater than 95:5 d.r. This method is practical, in that 36 examples, including a range of aldehydes and exo-vinyl heterocycles, are presented. By applying the newly developed method, the total synthesis of (+)-broussonetine G and formal synthesis of (+)-broussonetine H
Copper Catalyzed [3+2] Annulation Reaction of Exocyclic Sulfonyl Enamides for the Synthesis of N,O‐Spiroketal and Spiroketal
作者:Wen‐Fu Cheng、Shan‐Zeng Gao、Yu‐Chen Yang、Lijia Wang
DOI:10.1002/chem.202401062
日期:2024.8.6
A copper-catalyzed [3+2] annulation reaction of exocyclic enamines with 1,4-benzoquinone esters has been developed, providing facile access to various N,O-spiroketals and spiroketals.
[EN] CATALYST-CONTROLLED ALIPHATIC C-H OXIDATIONS<br/>[FR] OXYDATIONS D'UNE LIAISON C-H ALIPHATIQUE RÉGULÉES PAR CATALYSEUR
申请人:UNIV ILLINOIS
公开号:WO2015035412A1
公开(公告)日:2015-03-12
The invention provides simple small molecule, non-heme iron catalyst systems with broad substrate scope that can predictably enhance or overturn a substrate's inherent reactivity preference for sp3-hybridized C-H bond oxidation. The invention also provides methods for selective aliphatic C-H bond oxidation. Furthermore, a structure-based catalyst reactivity model is disclosed that quantitatively correlates the innate physical properties of the substrate to the site-selectivities observed as a function of the catalyst. The catalyst systems can be used in combination with oxidants such as hydrogen peroxide to effect highly selective oxidations of unactivated sp3 C-H bonds over a broad range of substrates.