Oxidation of Cyclopropane Terpenoids with Ruthenium Tetraoxide.
作者:Takahiro Kawai、Takashi Ooi、Takenori Kusumi
DOI:10.1248/cpb.51.291
日期:——
Oxidation products of cyclopropanoid terpenes, (-)-carane (4), (+)-cyclosativene (5), laurinterol methyl ether (6), and thujopsane (7), with rutheniumtetraoxide were investigated.
sesquiterpenoids, laurokamurols A–C (1–3), along with eight known related monomeric ones (4–11) were isolated from the East China Sea redalga Laurencia okamurai Yamada. The absolute configurations of the new bis-sesquitepenoids, especially their axial chirality, were determined by extensive spectroscopic analyses and TDDFT-ECD method. All of the new compounds showed promising PTP1B inhibitory activities with IC50
Halogenated and Non-halogenated Aromatic Sesquiterpenes from the Red Algae<i>Laurencia okamurai</i>Yamada
作者:Minoru Suzuki、Etsuro Kurosawa
DOI:10.1246/bcsj.52.3352
日期:1979.11
The taxonomic reexamination of the red alga ‘L. intermedia Yamada,’ previously collected at Oshoro Bay, Hokkaido, showed that this alga consistd of a mixture of L. intermedia Yamada, L. capituliformis Yamada, and L. okamurai Yamada. Within the Japanese species of genus Laurencia, laurinterol and debromolaurinterol were found to be characteristic metabolites of L. okamurai, not of L. intermedia. In the course of this examination, dibromophenol and debromoaplysinol were newly isolated.
对以前在北海道大所湾采集的红色藻类 "L. intermedia Yamada "进行的分类学重新研究表明,这种藻类由 L. intermedia Yamada、L. capituliformis Yamada 和 L. okamurai Yamada 混合而成。在日本的月桂属物种中,发现月桂醇和去氢月桂醇是大仓月桂的特征代谢物,而不是中间月桂的特征代谢物。在这次研究过程中,还新分离出了二溴苯酚和去溴芹醇。
Anti-Acanthamoeba Activity of Brominated Sesquiterpenes from Laurencia johnstonii
Focused on our interest to develop novel antiparasistic agents, the present study was aimed to evaluate the biological activity of an extract of Laurencia johnstonii collected in Baja California Sur, Mexico, against an Acantamoeba castellanii Neff strain. Bioassay-guided fractionation allowed us to identify the amoebicidal diastereoisomers α-bromocuparane (4) and α-isobromocuparane (5). Furthermore