Diversity-Oriented Approach to CF3CHF-, CF3CFBr-, CF3CF2-, (CF3)2CH-, and CF3(SCF3)CH-Substituted Arenes from 1-(Diazo-2,2,2-trifluoroethyl)arenes
摘要:
Arenes substituted with perfluoroalkyl groups are attractive targets for drug and agrochemical development. Exploiting the carbenic character of donor/acceptor diazo compounds, a diversity-oriented synthesis of perfluoroalkylated arenes, for late stage fluorofunctionalization, is described. The reaction of 1-(diazo-2,2,2-trifluoroethyl)arenes with HF, F/Br, F-2, CF3H, and CF3SH sources give direct access to a variety of perfluoroalkyl-substituted arenes presenting with incremental fluorine content. The value of this approach is also demonstrated for radiochemistry and positron emission tomography with the [F-18]-labeling of CF3CHF-, CF3CBrF-, and CF3CF2-arenes from [F-18]fluoride.
Three‐Component Reaction for the Synthesis of Highly Functionalized Propargyl Ethers
作者:Guillaume Pisella、Alec Gagnebin、Jérôme Waser
DOI:10.1002/chem.202001317
日期:2020.8.12
Multicomponent reactions provide efficient means to access molecular complexity. Herein, we report a copper‐catalyzed three‐component reaction of diazo compounds, alcohols and ethynyl benziodoxole (EBX) reagents for the synthesis of propargyl ethers. Extensive variations of the three partners of the reaction is possible, leading to highly functionalized and structurally diverse products under mild
Thermal Stability and Explosive Hazard Assessment of Diazo Compounds and Diazo Transfer Reagents
作者:Sebastian P. Green、Katherine M. Wheelhouse、Andrew D. Payne、Jason P. Hallett、Philip W. Miller、James A. Bull
DOI:10.1021/acs.oprd.9b00422
日期:2020.1.17
100 °C for the common diazo transfer reagent p-acetamidobenzenesulfonyl azide (p-ABSA). The Yoshida correlation is applied to DSC data for each diazocompound to provide an indication of both their impact sensitivity (IS) and explosivity. As a neat substance, none of the diazocompounds tested are predicted to be explosive, but many (particularly donor/acceptor diazocompounds) are predicted to be impact-sensitive
Access to <i>gem</i>-Difluoro Olefins via C–H Functionalization and Dual Role of Anilines
作者:Zhen Yang、Chao Pei、Rene M. Koenigs
DOI:10.1021/acs.orglett.0c02568
日期:2020.9.18
In this Letter, we describe a simple, practical approach in which cheap CuI was used as a catalyst to introduce a gem-difluoro olefin onto simple electron-rich aniline derivatives in good yield via direct C–H functionalization and a subsequent HF elimination reaction. Detailed mechanistic studies point at a dual role of aniline derivatives in this reaction, which serve as a substrate and a basic promoter
Synthesis of Quinolines via the Metal-free Visible-Light-Mediated Radical Azidation of Cyclopropenes
作者:Vladyslav Smyrnov、Bastian Muriel、Jerome Waser
DOI:10.1021/acs.orglett.1c01775
日期:2021.7.16
hypervalent iodine reagent as an azide radical source under visible-light irradiation. Multisubstituted quinoline products were obtained in 34–81% yield. The reaction was most efficient for 3-trifluoromethylcyclopropenes, affording valuable 4-trifluoromethylquinolines. The transformation probably proceeds through the cyclization of an iminyl radical formed by the addition of the azide radical on the
Copper‐catalyzed Si−H, B−H, P−H, S−H, and N−H insertion reactions of 2,2,2‐trifluoro‐1‐diazoethane and 1‐aryl 2,2,2‐trifluorodiazoethanes generated a large number of new fluorine‐containing chemical entities for medicinal chemists. With selected Si−H and B−H insertion reactions, we demonstrate successful extension to asymmetric catalysis.