Natural product research

Chemical constituents of the lichen, Candelaria concolor: A complete NMR and chemical degradative investigation

DA Dias, S Urban

Index: Dias, Daniel A.; Urban, Sylvia Natural Product Research, 2009 , vol. 23, # 10 p. 925 - 939

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Citation Number: 7

Abstract

A detailed chemical and spectroscopic investigation of the terrestrial lichen Candelaria concolor has yielded several lichenic metabolites belonging to the pulvinic acid series, as well as several depside derivatives including pulvinic dilactone (1), vulpinic acid (4) and calycin (5). The chemical transformation of 1 to pulvinic acid (3) is reported for the first time, as is the conversion of atranorin (6) to 5-chloroatranorin (7) and then finally to 5, 5′- ...