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.
Chemical Constituents of Marchantiophyta
Jungermannia hattoriana produces β-cyclocitral (12) (see Table 4.1). This represented the first isolation of this compound among the liverworts, when initially reported (590), although α-terpineol (17) has been isolated from Jungermannia vulcanicola (40).
Soluble carbohydrates of liverworts
Abstract Five soluble carbohydrates, (−)- l -bornesitol, (−)- d -mannitol, (+)- d -glucose, (+)-sucrose and (+)-trehalose, have been isolated as their acetyl derivatives from the liverwort, Mylia taylorii. The absolute configuration of these carbohydrates is the same as that of sugars found in vascular plants, although the liverwort sesquiterpenoids are usually enantiomeric relative to those of vascular plants. The soluble carbohydrates in seven other liverwort species have also been analysed by HPLC.