Cycloleucomelone

Cycloleucomelone (14) Anthracophyllum archeri, A. discolor [artefact ] 385), Boletopsis leucomelaena = Polyporus leucomelas) [Teucomelone ] (7, 386), Paxillus atrotomentosus 365)... 

Atromentin (13) is a key intermediate for further conversions, e.g. to more highly hydroxylated terphenylquinones and to pulvinic acids (see Section 2.1.3). Whereas polyporic acid (11) and ascocorynin (12) have not been observed as co-metabolites of more highly hydroxylated terphenylquinones, atromentin or its derivatives often co-occur with cycloleucomelone (14) (e.g. in Paxillus and Anthracophyllum) and with thelephoric acid (16) (e.g. in Hydnellum). In cultures of Omphalotus subilludens ( = Clitocybe subilludens) the relative proportion of atromentin to thelephoric acid decreases with ageing, which provides a strong indication that thelephoric acid is derived from atromentin (637). 

A reinvestigation of the constituents of B. leucomelaena obtained by extraction of the fungus with acetone has afforded principally the leuco-peracetates (53) and (54) of cycloleucomelone and thelephoric acid, respectively 386). The leuco-peracetate (53) has the same melting point as Akagi s protoleucomelone and we consider these compounds to be one and the same. 

On extraction of B. leucomelaena with methanol a blue-green solution resulted from which cycloleucomelone (14), the leuco-triacetate (58) and a blue pigment have been obtained 386). Because cycloleuco-... 

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