Herein, we disclose a Rh-catalyzed heteroarylation of C(sp)-H and C(sp)-H bonds in heterocycles with organoboron reagents. This protocol displays high efficiency and excellent functional group tolerance. A range of heterocyclic boronates with strong coordinating atoms, including pyridine, pyrimidine, pyrazole, thiophene, and furan derivatives, can be extensively served as the coupling reagents. The direct heteroarylation method could supply potential application in terms of the synthesis of drug molecules with multiple heterocycles.
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http://dx.doi.org/10.1021/acs.orglett.1c02546 | DOI Listing |
J Am Chem Soc
December 2024
Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom.
Under iridium-catalyzed conditions, 2-aza-aryl-substituted secondary alcohols undergo C(sp)-H addition reactions to alkynes to provide alkenylated tertiary alcohols. The processes occur with very high regio- and enantioselectivity. An analogous addition to styrene is shown to provide a prototype C(sp)-H alkylation process.
View Article and Find Full Text PDFOrg Lett
December 2024
DFG Cluster of Excellence livMatS @FIT, Institute of Organic Chemistry, Albertstraße 21, 79104 Freiburg (Breisgau), Germany.
facile access to -heteroaryl-fused bis-BODIPY scaffolds has been developed. A BODIPY dimer with an α,α-amine linker serves as a starting material to obtain pyrrole- and pyridine-fused BODIPYs, either by direct oxidation or by oxidative condensation with an aldehyde building block. Both species mark antipodal conjugative coupling conditions that result in distinct spectral outcomes.
View Article and Find Full Text PDFOrg Biomol Chem
November 2024
Hunan Provincial University Key Laboratory of the Fundamental and Clinical Research on Functional Nucleic Acid, Changsha Medical University, Changsha 410219, P. R. China.
A novel protocol for synthesizing 4-heteroaryl pyrazoles from readily available 2-aryl-3-indoles and diazopyrazolones through the rhodium(III)-catalyzed C-H bond activation has been achieved. This redox-neutral strategy features powerful reactivity, tolerates various functional groups, and proceeds with moderate yields under mild reaction conditions.
View Article and Find Full Text PDFJ Org Chem
December 2024
Laboratory of Physico-Chemistry of Materials and Electrolytes for Energy (PCM2E), Faculty of Sciences and Technologies, University of Tours, Tours 37200, France.
The first efficient Cu(I) catalyzed regioselective C3-(hetero)arylation of 6-(hetero)arylated 1,2,4-triazolo[4,3-]pyridazines has been developed to streamline the synthesis of pharmaceutically important 3,6-diarylated 1,2,4-triazolo[4,3-]pyridazines. This direct (hetero)arylation is compatible with a range of aryl iodides and tolerates a variety of functional groups (23 examples). A series of new 3,6-diarylated 1,2,4-triazolo[4,3-]pyridazines were synthesized with good to excellent yields (up to 98%).
View Article and Find Full Text PDFJ Org Chem
December 2024
Department of Synthetic Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States.
The synthesis of C1-functionalized β-carbolines from -Boc norharman is described. Substitution is realized by employing the Knochel-Hauser base (TMPMgCl·LiCl) followed by transmetalation with ZnCl and subsequent Negishi cross-coupling of the resulting organozinc species. A variety of aryl or heteroaryl bromides participated in this one-pot reaction sequence, allowing for rapid diversification of the β-carboline scaffold in moderate to excellent yields.
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