We describe a diversity-oriented one-pot telescopic synthesis of various benzo[]carbazoles with the naphthannulation of indoles as the key step, enabled by an intramolecular furan-olefin Diels-Alder reaction. This strategy is general and efficient across a wide range of substrates. We applied this method to synthesize and characterize the first benzo[]carbazole-based liquid crystalline materials, where the unique molecular design led to the formation of a rare nematic phase at room temperature.
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http://dx.doi.org/10.1039/d4cc00721b | DOI Listing |
Chem Sci
November 2024
School of Chemistry and Molecular Biosciences, University of Queensland Brisbane 4072 Queensland Australia
In 1981, Maier and Schleyer first identified a select number of cage bicyclic olefins (alkenes) as "hyperstable", and predicted them to be "remarkably unreactive", based solely on theoretical methods. Since that time only three systems meeting the criteria of a hyperstable alkene have been reported in the literature. A one-pot, telescoped synthesis, of four hyperstable alkenes is reported herein, which has uncovered unexpected reactivity towards oxidation.
View Article and Find Full Text PDFACS Med Chem Lett
November 2024
Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India.
Inhibition of vascular endothelial growth factor receptor 2 (VEGFR-2) facilitates potent antiangiogenic and anticancer responses. In this regard, the development of effective pharmacophores, i.e.
View Article and Find Full Text PDFJ Org Chem
October 2024
Faculty of Chemistry, University of Lodz, Tamka 12, Łódź 91403, Poland.
Readily available 2-unsubstituted imidazole -oxides were examined as starting materials for the preparation of fully substituted 1,4,5-aryl/alkyl 2-trifluoromethylsulfanyl-imidazoles. Whereas activation of the -oxide function followed by attempted nucleophilic addition of the SCF was in vain, the alternative approach involving "sulfur transfer reaction" and subsequent electrophilic trifluoromethylation with Togni reagent provided target products in high yield via a one-pot procedure. The structure of representative enantiomerically pure imidazol-2-yl trifluoromethyl sulfide was confirmed by X-ray analysis.
View Article and Find Full Text PDFJ Org Chem
September 2024
Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
Angew Chem Int Ed Engl
December 2024
Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, INDIA.
The tetrahydroquinoline (THQ) framework is commonly found in natural products and pharmaceutically relevant molecules. Apart from using transition metal catalysts and chiral phosphoric acids, the chiral 2-substituted 1,2,3,4-THQs are synthesized using amine oxidase biocatalysts. However, the use of imine reductases (IREDs) in their asymmetric synthesis remained unexplored.
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