Synthesis of 4-(pentafluorosulfanyl)benzenediazonium tetrafluoroborate and analogs and their application for the preparation of SF5-aromatics
申请人:Laali Kenneth K.
公开号:US09238660B1
公开(公告)日:2016-01-19
4-(pentafluorosulfanyl)benzenediazonium tetrafluoroborate salt was synthesized and isolated. The pentafluorosulfanyl salt was examined in a wide assortment of reactions to form novel SF5-bearing alkenes, alkynes, and biaryl derivatives using Heck-Matsuda, Sonogashira, and Suzuki coupling protocols. Dediazoniation of the salt furnished the corresponding p-SF5—C6H4X,C6H4OS(O)(CF3)═NSO2CF3, and p-SF5—C6H4-NTf2 derivatives. The azide derivative p-SF5—C6H4N3 entered into click chemistry with phenylacetylenes to furnish the corresponding triazoles. Various SF5-bearing alkenes were synthesized by coupling reactions using a metal catalyst. Fluorodediazoniation selectively furnished the fluoro derivative p-SF5—C6H4F. Homolytic dediazoniation gave the unsymmetrical biaryls, thus demonstrating the broad utility of pentafluorosulfanyl diazonium salts as building blocks of SF5-aromatics that are in high demand in many branches of chemistry including biomedicine and materials chemistry.
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‐Sulfinylamines as an Approach for the Metal‐free Synthesis of Sulfonimidamides:
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‐Benzotriazolyl Sulfonimidates as Activated Intermediates
作者:Maximilian Bremerich、Christian M. Conrads、Tim Langletz、Carsten Bolm
DOI:10.1002/anie.201911075
日期:2019.12.19
N-tritylsulfinylamine, and N-hydroxybenzotriazole hydrate in a process mediated by a tertiary amine. The formation of the sulfonimidate proceeds in inexpensive and environmentally benign dimethyl carbonate as the solvent, it does not require anhydrous conditions, and the product yields generally exceed 70 %. The substrate scope is broad, and a wide range of sensitive organic functionalities is well tolerated. The
Aromatic Chlorosulfonylation by Photoredox Catalysis
作者:Michal Májek、Michael Neumeier、Axel Jacobi von Wangelin
DOI:10.1002/cssc.201601293
日期:2017.1.10
Visible‐lightphotoredoxcatalysis enables the efficient synthesis of arenesulfonyl chlorides from anilines. The new protocol involves the convenient in situ preparation of arenediazonium salts (from anilines) and the reactive gases SO2 and HCl (from aqueous SOCl2). The photocatalytic chlorosulfonylation operates at mild conditions (room temperature, acetonitrile/water) with low catalyst loading. Various
Evaluation of<i>tert</i>-Butyl Isosteres: Case Studies of Physicochemical and Pharmacokinetic Properties, Efficacies, and Activities
作者:Matthias V. Westphal、Bernd T. Wolfstädter、Jean-Marc Plancher、John Gatfield、Erick M. Carreira
DOI:10.1002/cmdc.201402502
日期:2015.3
bioactive compounds is often accompanied by unwanted property modulation, such as increased lipophilicity and decreased metabolic stability. Several alternative substituents are available for the drug discovery process. Herein, physicochemical data of two series of drug analogues of bosentan and vercirnon are documented as part of a comparative study of tert‐butyl, pentafluorosulfanyl, trifluoromethyl
Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue Abstract A green, efficient, photoinduced synthesis of arylboronic esters and aryl sulfides has been developed. Bench stable arylazosulfones were used as radical precursors for a photocatalyst- and additive-free carbon–heteroatom bond formation under visible light. The protocols are applicable to a wide range of substrates, providing