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Stevanović, D./ I. Damljanović/ M. Vukićević/ N. Manojlović/ N. S. Radulović/ R. D. Vukićević 2011: Electrochemical chlorination of physcion. - Helvetica Chimica Acta 94(8): 1406-1415. [RLL List # 224 / Rec.# 33206]
Keywords: Electrochemical chlorination/ Lichen/ Physcion/ Secondary metabolites/ Electrochemical chlorination/ Electrophilic attack/ Lichen/ Medium-pressure liquid chromatography/ Naturally occurring/ Physcion/ Product mixture/ Resonance stabilization/ Secondary metabolites/ Spectral data/ Synthetic utility/ Biomolecules/ Chlorination/ Column chromatography/ Cyclic voltammetry/ Electrolysis/ Liquid chromatography/ Metabolism/ Metabolites/ 2 chlorophyscion/ 2,4 dichloro 1,8 dihydroxy 3 methoxy 6 methylanthracene 9,10 dione/ 2,4,5 trichlorophyscion/ 4 chlorophyscion/ 4,5 dichlorophyscion/ physcion/ unclassified drug/ article/ chlorination/ column chromatography/ cyclic potentiometry/ drug synthesis/ electrolysis/ lichens/ liquid chromatography/ molecular stability/ nonhuman/ priority journal/ stereochemistry
Abstract: The electrochemical chlorination of physcion (=1,8-dihydroxy-3-methoxy-6- methylanthracene-9,10-dione; 1) in AcOH and CH2Cl2 was investigated by cyclic voltammetry and prep.-scale electrolysis. This approach provided access to a number of diverse biologically and pharmacologically interesting chlorinated secondary metabolites of lichen. Unlike the only previous literature report on the 'classical' chlorination of physcion (1), which allowed the preparation of 4-chlorophyscion (2b), 4,5-dichlorophyscion (3b), and 2,4,5-trichlorophyscion (4), the present procedure also gave fragilin (=2-chlorophyscion; 2a) and 2,4-dichlorophyscion (3a), alongside the previously obtained 2b, 3b, and 4. All of these compounds, except for 2a, were isolated by column chromatography and medium-pressure liquid chromatography (MPLC) and characterized by spectral data. The preparative electrolysis with a 2F·mol-1 charge consumption in AcOH and 10F·mol -1 in CH2Cl2 may have a practical synthetic utility, since the thus obtained product mixtures can be readily fractioned by column chromatography to afford pure 2b and 4, respectively. The regioselectivity of the reaction is explained by the resonance stabilization of the corresponding arenium cations
– doi: 10.1002/hlca.201100011

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