
%0 Journal Article
%A Djura, P 
%A Sargent, MV 
%T Depsidone synthesis. III. Grayanic acid
%J Australian Journal of Chemistry
%D 1976/04/01
%V 29
%N 4
%P 899-906
%K 
%R https://doi.org/10.1071/CH9760899
%U https://www.publish.csiro.au/paper/CH9760899 
%X The structure of the lichen depsidone grayanic acid (1) (6-heptyl-8-hydroxy-3-methoxy-1-methyl-11- oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid) proposed by Shibata and Chiang was confirmed by the synthesis firstly of methyl O-methylgrayanate (19), and then of grayanic acid itself. The key step in both syntheses was an Ullmann reaction. 
