An approach to synthesizing structurally diverse toluene derivatives via sequential -C-H and benzylic C-N deaminative functionalization was developed by using a recyclable bifunctional directing template. The functionalized Katritzky salt intermediates are shown to be engaged in a wide range of carbon-carbon and carbon-heteroatom bond formation reactions. The synthetic utility of the strategy was demonstrated by late-stage functionalization of toloxatone.
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http://dx.doi.org/10.1021/acs.orglett.4c02781 | DOI Listing |
Chem Sci
December 2024
State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
1,2--Aryl furanosides are prevalent in nature and exhibit significant biological activities. The 1,2- configuration is less favorable in terms of stereoelectronic and steric effects, making the synthesis of this type of skeleton highly challenging. Traditional methods for the synthesis of 1,2--aryl furanosides usually require complicated protection manipulations, resulting in lengthy synthetic routes and low overall efficiency.
View Article and Find Full Text PDFJ Org Chem
December 2024
Department of Organic Chemistry I, Faculty of Chemistry, University of the Basque Country UPV/EHU, Manuel Lardizabal Pasealekua 3, 20018 Donostia/San Sebastián, Spain.
The deaminative coupling of gramines with nucleophiles represents a versatile approach for structure diversification, but often involves non innocent conditions and/or reagents. Here a new acetylenic reagent is developed for the C-N bond activation of gramines and their in situ coupling with - and -centered nucleophiles. Using the new acid/base- and redox-neutral ynone reagent the coupling reactions proceed exceedingly as exemplified by the synthesis of several indol-3-ylmethyl derivatives, including new indole-benzodiazepine and indole-hydrazone conjugates.
View Article and Find Full Text PDFOrg Lett
November 2024
School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, 752050, Odisha, India.
A Ni-catalyzed C-N bond activation of 2-pyridylpyridone and 1-(9-alkyl 9-purin-6-yl)pyridin-2(1)-one and coupling with arylboronic acid have been achieved. A unique feature of this reaction is the strategic activation of the bridging C-N bond and replacement of the pyridone unit with aryl groups using nickel catalyzed Suzuki-Miyaura coupling. This provides an exciting new tool to build C-C bonds in the place of pyridones.
View Article and Find Full Text PDFJ Org Chem
September 2024
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Palladium-catalyzed Suzuki-Miyaura cross-coupling is an efficient approach for C-C bond construction. Here we report a deaminative Suzuki-Miyaura reaction to achieve chemo- and regioselectivity in the cross-coupling of nonactivated propargylamines with boronic acids, in which methyl propiolate is introduced to promote the cleavage of the C-N bond to form the C-C bond. This method features a wide range of substrates, good functional group tolerance, and ease of operation, providing an alternative approach to accessing valuable propargylated aromatic compounds.
View Article and Find Full Text PDFOrg Lett
September 2024
College of Chemistry, State Key Laboratory of Elementoorganic Chemistry, Nankai University, Tianjin 300071, China.
An approach to synthesizing structurally diverse toluene derivatives via sequential -C-H and benzylic C-N deaminative functionalization was developed by using a recyclable bifunctional directing template. The functionalized Katritzky salt intermediates are shown to be engaged in a wide range of carbon-carbon and carbon-heteroatom bond formation reactions. The synthetic utility of the strategy was demonstrated by late-stage functionalization of toloxatone.
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