Lactarius rubrocinctus

Recently, we have isolated the aldehyde rubrocinctal A (7.5), the carboxymethyl ester rubrocinctal B (7.7), and the corresponding 6-oxostearoyl esters 7.6 and 7.8 from Lactarius rubrocinctus (Section Ichorati) (23) (Table 7). These compounds are the first examples of 12-oxygenated isovellerol derivatives from a Lactarius species. 

The aldehyde rubrocinctal A (7.4), the 12-carboxymethyl ester rubrocinctal B (7.16), and the corresponding 6-oxostearoyl esters 7.27 and 7.31 were isolated from Lactarius rubrocinctus Section Ichorati (2), (69). They are of special interest because they are, along with glutinopallal esters 8.2 and 8.3, the only examples of 12-oxygenated sesquiterpenes isolated from Lactarius species. 

De Bernardi, M., G. Fronza, A.P. Gatti, G. Vidari, and P. Vita-Finzi New Marasmane Sesquiterpenes from Lactarius rubrocinctus (Basidiomycetes). 15th lUPAC International Symposium on the Chemistry of Natural Products, PA 75 (1986). 

Fatty acid esters of other marasmane sesquiterpenoids, as the two rubrocinctal derivatives 7.6 and 7.8, have been isolated so far only from L. rubrocinctus (23). Of limited distribution are also the farnesane fatty acid esters 1.3-1.9 (8), drimenol (3.2-3.6) and uvidin A (3.16-3.20) esters (11), violascensol lactarinate 5.2 (23), and the two glutinopallane esters 8.2 and 8.3 (42). Further unprecedented sesquiterpenoids are the guaiane esters 4.10-4.13 contained in intact specimens of Lactarius species of the Section Dapetes (14, 16, 21, 22). Various mixtures of yellow esters 4.12 and 4.13, red stearoylsangol (4.11), and blue stearoyldeterrol (4,10) are responsible for the beautiful colours of the latex of these species. 

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See also in sourсe #XX -- [ , ]

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