Glutinopallal esters

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. 

The only two known natural glutinopallane sesquiterpenes 8.2 and 8.3 were isolated from frozen fruiting bodies of L. glutinopallens extracted with CH2CI2 (74). The two esters were separated by preparative HPLC on a RP-18 column with Me0H-H20, 95 5, the fatty acids being identified by GC after methanolysis, as palmitic and stearic acids. In the EIMS spectra of glutinopallal esters, the molecular ions at... 

Favre-Bonvin, J., and K. Gluchoff-Fiasson Structures of Two Glutinopallal Esters, New Natural Sesquiterpenoids from Lactarius glutinopallens. Phytochemistry, 27, 286 (1988). 

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