SESQUITERPENOID EMMOTINS FROM 2 PORAQUEIBA SPECIES

The phytochemical examination of the trunkwood of Poraqueiba guianensi s afforded two novel emmotins, emmotin-Z [(2R, )-5-formyl-8-methyl-1,2 ,3,4-tetrahydronaphthalene] and its 6-O-methyl ether, two known seco-i ridoids, secologanoside and its methyl ester, both of them obtained as natural products in their pure form, a new triterpenoid acid, icacini c acid reported elsewhere, and a rare lignan, 1-hydroxypinoresional, a long with sitosterol, its 3-O-beta-D-glucoside and glucose. Emmotin-Z was also isolated from P. paraensis, besides pinoresinol.