Base-catalysed <sup>18</sup>F-labelling of trifluoromethyl ketones. Application to the synthesis of <sup>18</sup>F-labelled neutrophil elastase inhibitors
作者:Denise N. Meyer、Miguel A. Cortés González、Xingguo Jiang、Linus Johansson-Holm、Monireh Pourghasemi Lati、Mathias Elgland、Patrik Nordeman、Gunnar Antoni、Kálmán J. Szabó
DOI:10.1039/d1cc03624f
日期:——
A new method for the fluorine-18 labelling of trifluoromethyl ketones has been developed. This method is based on the conversion of a–COCF3 functional group to a difluoro enol silyl ether followed by halogenation and fluorine-18 labelling. The utility of this new method was demonstrated by the synthesis of fluorine-18 labelled neutrophil elastase inhibitors, which are potentially useful for detection
Trifluoromethylthiolation, Trifluoromethylation, and Arylation Reactions of Difluoro Enol Silyl Ethers
作者:Xingguo Jiang、Denise Meyer、Dominik Baran、Miguel A. Cortés González、Kálmán J. Szabó
DOI:10.1021/acs.joc.0c01030
日期:2020.7.2
This study reports a new application area of difluoro enolsilylethers, which can be easily obtained from trifluoromethyl ketones. The main focus has been directed to the electrophilic fluoroalkylation and arylation methods. The trifluoromethylthiolation of difluoro enolsilylethers can be used for the construction of a novel trifluoromethylthio-α,α-difluoroketone (−COCF2SCF3) functionality. The
Organocatalytic asymmetric synthesis of 3-difluoroalkyl 3-hydroxyoxindoles
作者:Yun-Lin Liu、Jian Zhou
DOI:10.1039/c2cc17140f
日期:——
We report the first example of highly enantioselective organocatalytic synthesis of 3-difluoroalkyl substituted 3-hydroxyoxindoles. The total synthesis of the difluoro analogue of convolutamydine E was achieved by this method.
Photoredox-catalyzed redox-neutral difluoroalkylation to construct perfluoroketones with difluoroenoxysilanes
作者:Jian-Yu Zou、Yu-Zhao Wang、Wen-Hui Sun、Wu-Jie Lin、Xue-Yuan Liu
DOI:10.1039/d1ob01530c
日期:——
difluoroalkylation of difluoroenoxysilanes is developed. The reaction includes a strategy of combination of two fluorine-containing functional groups, which confers the reaction with characteristics like high efficiency, mild conditions, and broad scope. A variety of fluoroalkyl halides including perfluoroalkyl iodides, bromo difluoro esters and amides can be employed as radical precursors. Control experiments
remarkable fluorine effect on “on water” reactions is reported. The CF⋅⋅⋅HO interactions between suitably fluorinated nucleophiles and the hydrogen‐bond network at the phase boundary of oil droplets enable the formation of a unique microstructure to facilitate on water catalyst‐free reactions, which are difficult to realize using nonfluorinated substrates. Accordingly, a highlyefficient on water, catalyst‐free