Catalytic Ester to Stannane Functional Group Interconversion via Decarbonylative Cross-Coupling of Methyl Esters
作者:Huifeng Yue、Chen Zhu、Magnus Rueping
DOI:10.1021/acs.orglett.7b03669
日期:2018.1.19
An unprecedented conversion of methyl esters to stannanes was realized, providing access to a series of arylstannanes via nickel catalysis. Various common esters including ethyl, cyclohexyl, benzyl, and phenyl esters can undergo the newly developed decarbonylative stannylation reaction. The reaction shows broad substrate scope, can differentiate between different types of esters, and if applied in
A process for fluorination of aromatic compounds employing iodonium ylides and applicable to radiofluorination using
18
F is described. Processes, intermediates, reagents and radiolabelled compounds are described.
The transition-metal-free 211At-astatination of spirocyclic aryliodonium ylides via a nucleophilic aromatic substitution reaction is described. This method enables the preparation of 211At-radiolabeled compounds derived from multi-functionalized molecules and heteroarenes in good to excellent radiochemical yields.
描述了通过亲核芳族取代反应对螺环芳基碘叶立德进行无过渡金属的211 At-砹化。该方法能够以良好至优异的放射化学产率制备211种源自多功能分子和杂芳烃的 At 放射性标记化合物。
Silver-Mediated Trifluoromethoxylation of Aryl Stannanes and Arylboronic Acids
A silver-mediated cross-coupling of trifluoromethoxide with aryl stannanes and arylboronic acids to give aryl trifluoromethyl ethers is reported. This is the first report of a transition-metal-mediated C-aryl-OCF3 bond formation.
Silver-Catalyzed Late-Stage Fluorination
作者:Pingping Tang、Takeru Furuya、Tobias Ritter
DOI:10.1021/ja105834t
日期:2010.9.1
Carbon-fluorine bond formation by transition metal catalysis is difficult, and only a few methods for the synthesis of aryl fluorides have been developed. All reported transition-metal-catalyzed fluorination reactions for the synthesis of functionalized arenes are based on palladium. Here we present silver catalysis for carbon-fluorine bond formation. Our report is the first example of the use of the transition metal silver to form carbon-heteroatom bonds by cross-coupling catalysis. The functional group tolerance and substrate scope presented here have not been demonstrated for any other fluorination reaction to date.