A general approach for the α-arylation of heteroarenes with nitroarenes via denitrative coupling is reported for the first time. Various heteroarenes, including derivatives of furan, benzofuran, pyrrole, indole, thiophene, and benzothiophene, can be arylated at the α-position in moderate to good yields. Mechanistic studies demonstrate that the reaction proceeds via a CMD pathway, with C-H bond activation as the rate-determining step. Furthermore, the scalability and applicability in the synthesis of a drug molecule exemplify the utility of this protocol.
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http://dx.doi.org/10.1021/acs.orglett.4c02340 | DOI Listing |
Polarity reversal, or "umpolung", is a widely acknowledged strategy to allow organic functional groups amenable to react in alternative ways to the usual preference set by their electronic features. In this article, we demonstrate that cyclohexyne umpolung, realized through complexation to zirconocene, makes the small strained cycloalkyne amenable to C-F bond functionalisation. Such strong bond activation chemistry is unprecedented in "free" aryne and strained alkyne chemistry.
View Article and Find Full Text PDFThe selective amination of aromatic C-H bonds is a powerful strategy to access aryl amines, functionalities found in many pharmaceuticals and agrochemicals. Despite advances in the field, a platform for the direct, selective C-H amination of electronically diverse (hetero)arenes, particularly electron-deficient (hetero)arenes, remains an unaddressed fundamental challenge. In addition, many (hetero)arenes present difficulty in common selective pre-functionalization reactions, such as halogenation , or metal-catalyzed borylation and silylation .
View Article and Find Full Text PDFMolecules
January 2025
School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan.
Oxazole, a versatile and significant heteroarene, serves as a bridge between synthetic organic chemistry and applications in the medicinal, pharmaceutical, and industrial fields. Polycyclic aromatic compounds with amino groups substituted at the 2-position of an oxazole, such as 2-aminonaphthoxazoles, are expected to be functional probes, but their synthetic methods are extremely limited. Herein, we describe electrochemical reactions of 3-amino-2-naphthol or 3-amino-2-anthracenol and isothiocyanates in DMSO, using a graphite electrode as an anode and a platinum electrode as a cathode in the presence of potassium iodide (KI), which afford -arylnaphtho- and -arylanthra[2,3-]oxazol-2-amines via cyclodesulfurization.
View Article and Find Full Text PDFChem Asian J
January 2025
Kyoto Institute of Technology: Kyoto Kogei Sen'i Daigaku, Faculty of Molecular Chemistry and Engineering, Goshokaido-cho, Matsugasaki, Sakyo-ku, 606-0962, Kyoto, JAPAN.
Heteroarene-fused heteroles have attracted considerable attention owing to their unique electronic and photophysical properties. The bridging element plays a crucial role in determining the electronic characteristics of the resulting π-conjugated molecules. In this study, we synthesized a series of heteroarene-fused benzo[b]arsoles and investigated their structures and photophysical properties.
View Article and Find Full Text PDFChem Commun (Camb)
January 2025
Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, China.
We present a rapid and versatile Au(I)-catalyzed strategy for functionalizing N-heteroarenes using TBAF as a nucleophile or base, enabling varied transformations. The method accommodates diverse substrates, offering excellent yields and functional group tolerance. Distinct reaction pathways highlight its adaptability, expanding chemical diversity for organic synthesis.
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