Sesquiterpene constituents of the liverwort Calypogeia muelleriana
作者:Ute Warmers、Kolja Wihstutz、Nils Bülow、Christiane Fricke、Wilfried A König
DOI:10.1016/s0031-9422(98)00283-0
日期:1998.11
The lipophilic constituents of the liverwort Calypogeia muelleriana were investigated. A new sesquiterpene hydrocarbon, maali-1,3-diene, and two sesquiterpene alcohols with an aromadendrane skeleton, 3-hydroxyledene and 4,5-dehydroviridiflorol, were isolated and identified. The structure elucidation was carried out mainly by NMR spectroscopic techniques ((1)H-, (13)C-, (1)H(1)H-COSY-, HMQC-, HMBC-
Novel cytotoxic and phytotoxic halogenated sesquiterpenes from the green alga Neomeris annulata
作者:David E. Barnekow、John H. Cardellina、Andrew S. Zektzer、Gary E. Martin
DOI:10.1021/ja00192a004
日期:1989.5
The cytotoxicity and phytotoxicity observed in extracts of the calcareous greenalgaNeomerisannulata were traced to a fraction containing a trio of new halogenatedsesquiterpenes. The application of zero-quantum and reverse-detected multiple-quantum 2D NMR techniques was pivotal in the elucidation of the structures. Three different, seemingly biosynthetically related carbon skeletons, one of them
Microbial transformation of the sesquiterpenoid (−)-maaliol by Mucor plumbeus
作者:Yanmei Wang、Teck-Koon Tan、Geok Kheng Tan、Joseph D. Connolly、Leslie J. Harrison
DOI:10.1016/j.tet.2009.05.035
日期:2009.7
Microbialtransformation of the sesquiterpenoid (−)-maaliol by the fungus Mucor plumbeus gave two metabolites, (+)-7,8-didehydro-9β-hydroxymaalioxide and (−)-7,8-didehydro-1β-hydroxymaalioxide. Both metabolites are new and their structures were established on the basis of their spectroscopic properties and chemical reactions.