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A photocatalytic Smiles rearrangement, triggered by radical difluoromethylation of conjugated arylsulfonylated amides, was developed to construct both β-difluoromethyl amide and heterocyclic scaffolds selectively. This transformation features mild conditions and broad substrate scope. More importantly, the chemoselectivity of the intermediate amidyl radical could be altered completely by simply changing the light source, along with addition of water to the reaction mixture.
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http://dx.doi.org/10.1039/d2ob00186a | DOI Listing |
Org Lett
December 2024
Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, China.
We herein report a photochemical Truce-Smiles rearrangement reaction of -sulfinyl acrylamides with bromodifluoroacetamides resulting in the synthesis of a series of aryl difluoroglutaramides in moderate to good yields. The asymmetric synthesis using chiral sulfinamides produced quaternary carboncentered glutaramide products with a modest enantioselectivity. This protocol effectively complements previous Truce-Smiles rearrangement methods involving -sulfonyl acrylamides.
View Article and Find Full Text PDFTalanta
December 2024
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, China. Electronic address:
Cysteine (Cys) plays a critical role in various biological processes, including protein synthesis, cellular signaling, and antioxidant defense. However, precise detection of Cys in biological systems remains challenging due to interference from similar thiols such as homocysteine (Hcy) and glutathione (GSH). In this study, we report the synthesis and bioimaging of a novel ratio-type fluorescent probe based on the benzoBODIPY fluorophore, designed for the ratiometric detection of Cys.
View Article and Find Full Text PDFChem Commun (Camb)
December 2024
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Łódź, Poland.
Photocyclization of 8-aryloxy-3-phenylbenzo[][1,2,4]triazines leads to π-delocalized helicene radicals 1[n] ( = 5, 6, 7) containing the ring-fused 1,4-dihydro[1,2,4]triazin-4-yl as a spin source. Single crystal XRD revealed that the photocyclization to 1[n] involves a Smiles rearrangement. Radicals 1[n] were investigated by spectroscopic, electrochemical and DFT methods, while racemic helicene 1[7] was resolved and ECD spectra were recorded.
View Article and Find Full Text PDFOrg Lett
December 2024
Institute of Green Chemistry and Molecular Engineering, GBRCE for Functional Molecular Engineering, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou 510006, PR China.
Radical Smiles rearrangements have emerged as powerful methodologies for constructing carbon-carbon bonds through intramolecular radical addition and fragmentation under milder conditions, with SO released as a byproduct. However, SO-retaining Smiles rearrangements, which can yield valuable alkyl sulfone derivatives, have been scarcely explored. In this study, we present an unprecedented iron-catalyzed SO-retaining Smiles rearrangement initiated by the decarboxylation of aliphatic carboxylic acids.
View Article and Find Full Text PDFInt J Mol Sci
November 2024
Institute of Fine Organic Chemistry of A. L. Mnjoyan, Scientific Technological Center of Organic and Pharmaceutical Chemistry of National Academy of Science of Republic of Armenia, Ave. Azatutyan 26, Yerevan 0014, Armenia.
Herein we describe the synthesis and rearrangement of 1,3-diamino-2,7-naphthyridines and 1-amino-3-oxo-2,7-naphthyridines. In the case of 1,3-diamino-2,7-naphthyridines, it was found that the rearrangement reaction was influenced by both the substituent at the 7th position of the 2,7-naphthyridine ring and by the nature of the cyclic amine at the 1st position. The influence was mainly steric.
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