We describe a visible light-induced palladium-catalyzed radical germylative arylation of alkenes with easily accessible chlorogermanes. This protocol provides expedient access to germanium-substituted indolin-2-ones in good to excellent yields under mild reaction conditions. The key step for this strategy lies in the reductive activation of germanium-chloride bonds with an excited palladium complex under visible light irradiation. The involvement of germanium radicals was evidenced by electron paramagnetic resonance spectroscopy experiments.
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http://dx.doi.org/10.1021/acs.joc.4c01456 | DOI Listing |
Angew Chem Int Ed Engl
October 2024
RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074, Aachen, Germany.
Org Lett
October 2024
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China.
We report a visible-light-driven, palladium-catalyzed 1,4-difluoromethylative functionalization of conjugated dienes using chlorodifluoromethane (ClCFH, Freon-22) as a cost-effective difluoromethyl source. The excited palladium catalyst efficiently reduces the C-Cl bond, which generates a CFH radical, followed by regioselective S2' substitution to afford 1,4-difunctionalized products. This versatile, redox-neutral method accommodates diverse nucleophiles and exhibits broad functional group compatibility, making it suitable for late-stage functionalization in drug discovery and offering a direct route to difluoromethylated molecules.
View Article and Find Full Text PDFOrg Lett
October 2024
State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China.
Multicomponent radical tandem reactions have emerged as a crucial technique for synthesizing complex molecules in organic chemistry. In this study, we report a palladium-catalyzed four-component difluoroalkylative carbonylation of enynes and ethyl difluoroiodoacetate. This transformation proceeds through a multistep sequential reaction that introduces reactive difluoro and carbonyl groups while constructing the benzofuran skeleton.
View Article and Find Full Text PDFJ Org Chem
September 2024
College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, P. R. China.
ACS Cent Sci
June 2024
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321017, China.
1,4-cis-Disubstituted cyclic compounds play a pivotal role in pharmaceutical development, offering enhanced potency and bioavailability. However, their stereoselective and modular synthesis remains a long-standing challenge. Here, we report an innovative strategy for accessing these structures via mild conditions employing cyclic 1,3-dienes/alkyl(aryl)halides and amines.
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