The unambiguous total synthesis of ten O-methyl and/or C-hydroxy derivatives of gyrophoric acid (1) has been achieved by using the condensation of an appropriately substituted benzole acid and benzyl lecanorate (33) or benzyl 2-O-methyllecanorate (32) in the key step.
Elix, John A.,Jayanthi, Vilas K.,McCaffery, Leslie F.,Yu, Jin
p. 1045 - 1052
(2007/10/03)
3-Hydroxyumbilicaric Acid and 3-Methoxyumbilicaric Acid, New Tridepsides from the Lichen Parmelinopsis bonariensis
The new tridepsides 3-hydroxyumbilicaric acid (4) and 3-methoxyumbilicaric acid (5) have been detected in the lichen Parmelinopsis bonariensis and the structures established by unambiguous synthesis.
Elix, John A.,Jin, Yu,Adler, Monica T.
p. 765 - 770
(2007/10/02)
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