Pinguisane-Type Sesquiterpenes from the South American Liverwort Porella recurva (Taylor) Kuhnemann
The chemical composition of a dichloromethane extract of the South American liverwort Porella recurva has been examined. Two new pinguisane-type norsesquiterpenoid natural products were isolated: 6,11-epoxy-15-nor-3,4-dioxo-5,10-pinguisadien-12-acetate and 6,11- epoxy-15-nor-4-oxo-5,10-pinguisadien-12-acetate. In addition two known pinguisane-type sesquiterpenes were also isolated: norpinguisone and norpinguisone methyl ester. All structures were elucidated by means of NMR spectroscopic techniques and mass spectrometry.
Sesquiterpene lactones and flavones of Iva frutescens
Abstract Extraction of Iva frutescens L. ssp. frutescens gave a new germacranolide frutescin, whose structure was established, and the flavone centaureidin (5,7,3′-trihydroxy-3,6,4′-trimethoxy-flavone). Iva frutescens L. ssp. oraria (Bartlett) Jackson furnished pectolinarigenin (5,7-dihydroxy-6,4′-dimethoxyflavone) and hispidulin (6-methoxy-5,7,4′-trihydroxyflavone).
Sesquiterpene hydrocarbons of the liverwort Scapania ornithopodioides
Abstract The liverwort, Scapania ornithopodioides, was investigated for sesquiterpene hydrocarbons by utilizing GC and GCIMS and 17 components were identified. Among these, the major component, aromadendrene, and two minor ones, cyclosativene and α-farnesene are reported for the first time as constituents of liverworts. In addition, aromadendrene also occurred in three other Taiwanese liverworts examined.