
TY  - JOUR
A1  - Gill, Melvyn 
A1  - Morgan, Peter M. 
A1  - Yu, Jin 
A1  - White, Jonathan M. 
T1  - Pigments of Fungi. XLVII. Cardinalic Acid, a New Anthraquinone Carboxylic Acid from the New Zealand Toadstool <emph type="2">Dermocybe cardinalis</emph> and the Synthesis and  X-Ray Crystal Structure of Methyl 1,7,8-Tri-<emph type="2">O</emph>-methylcardinalate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1998
VL  - 51
IS  - 3
SP  - 213
EP  - 218
KW  - 
UR  - https://doi.org/10.1071/C97154 
N2  - Cardinalic acid (1,7,8-trihydroxy-6-methoxy-3-methyl-9,10-dioxoanthracene-2-carboxylic acid) (4) and the known anthraquinone carboxylic acids endocrocin (1), dermolutein (2) and cinnalutein (3) have been isolated from the New Zealand toadstool Dermocybe cardinalis. Methyl 1,7,8-tri-O-methylcardinalate (5) has been prepared both by permethylation of the natural product (4) and from 2,6-dichloro-1,4-benzoquinone by two consecutive regioselective Diels&#8211;Alder cycloaddition reactions. A single-crystal X-ray structure analysis of the ester (5) corroborates the structure of the natural product (4) and confirms the outcome of both cycloaddition reactions. 
ER  -

