A sesquiterpene ether from Laurencia obtusa

Marine natural products

“…from Dakar in a paper that discusses thermal isomerizations and conformational motion in selected xenicane derivative^.^^ The total synthesis of (+)-spat01 (94) A new sesquiterpene ether, dactyloxene D (136), has been reported from L. obtusa from the Gulf of Suez. 114 The structure and stereochemistry of 3,4-epoxypalisadin A (137) from L. J E e ~i l i s ~~~ was determined by an X-ray crystallographic study.l16 The structure of palisadin B (138), obtained from a Chinese specimen of L . kurlae but originally isolated from L.JEexili~,~" was likewise confirmed by X-ray diffraction analysis.118 (-)-Filiformin (1 39), which is a metabolite of L. J i l i f ~r r n i s , ~~~ has been synthesized in an enantiocontrolled manner.120 Peyssonols A (140) and B (141) are rare sesquiterpene hydroquinones from a Red Sea Peyssonnelia sp.…”

Nonhalogenated organic molecules from Laurencia algae

“…Two rearranged synderanes 67 and 68 with an acyclic side chain were identified from Hawaiian L. nidifica, and the latter was the only example featuring a phenyl group in snyderane derivatives from Laurencia (Sun et al 1976). Four epoxy sesquiterpenes with a rearranged synderane backbone were characterized from Chinese L. mariannensis (69) (Ji et al 2007b), Egyptian L. obtusa (70) (Ayyad et al 1994), and Japanese L. luzonensis (71 and 72) (Makhanu et al 2006), and the missing methyl group at C-7 of 72 was added here according to its 13 C NMR data (Makhanu et al 2006). Overall, the structure elucidation of 65-72 was preliminary, and the absolute configurations and even some relative ones remained unresolved.…”