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- W2953070680 abstract "A series of substituted xanthones was synthesized in order to prove the hypothesis that electron-withdrawing substituents enhance the antimycobacterial activity of these compounds, which is described by means of a QSAR equation with 13C NMR chemical shifts as independent parameters. The key step of the synthesis is the formation of substituted 2-phenoxybenzoic acids by Ullmann reaction followed by intramolecular Friedel-Crafts acylation, leading to methyl-, carboxy-, nitro-, cyano-, and aminoxanthones as a test set for QSAR investigations. Spectroscopic data (1H and 13C chemical shifts, IR, UV) of these xanthones are presented and analyzed. Specific shift increments for xanthones depending on the substituent position and on the position of the respective proton/carbon atom as well as additivity rules were developed." @default.
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- W2953070680 date "1998-05-01" @default.
- W2953070680 modified "2023-10-17" @default.
- W2953070680 title "Substituted Xanthones as Antimycobacterial Agents, Part 1: Synthesis and Assignment of1H/13C NMR Chemical Shifts" @default.
- W2953070680 doi "https://doi.org/10.1002/(sici)1521-4184(199805)331:5<177::aid-ardp177>3.0.co;2-k" @default.
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