Triterpenoids from the fern Goniophlebium mengtzeense
摘要:
Two new triterpenoids, fern-9(11)-en-20 alpha-yl palmitate and 8 beta H-fern-9(11)-en-7-one were isolated from the fresh fronds of Goniophlebium mengtzeense. Their structures were established by spectroscopic techniques and chemical correlation. Thirty-seven other compounds were identified from this fern. (C) 1997 Published by Elsevier Science Ltd. All rights reserved.
Spiro-triterpenes from clay-catalysed rearrangement of hopenes: NMR structural elucidation and occurrence in a recent sediment
摘要:
Acidic K-10 montmorillonite clay-catalysed rearrangement of hop-22(29)-ene 5 and of hop-17(21)-ene 6 leads to the formation of small quantities of various fernenes and of new compounds, the 14-methyl-13,15-cyclo-B':A'-neo-26-nor-14,15-seco-18 alpha-gammacer-7-ene 8 and its Delta(8)- and Delta(9(11))-isomers 9 and 10, the structures of which have been established by MS and NMR spectroscopy. This novel hopane skeleton transposition also operates an bacterial sedimentary hopenes, as shown by GC-MS investigations of the alkene fraction from a recent lacustrine sediment.
Spiro-triterpenes from clay-catalysed rearrangement of hopenes: NMR structural elucidation and occurrence in a recent sediment
作者:Verena Hauke、Jean M. Trendel、Pierre Albrecht、Jacques Connan
DOI:10.1016/s0040-4039(00)76804-3
日期:1994.4
Acidic K-10 montmorillonite clay-catalysed rearrangement of hop-22(29)-ene 5 and of hop-17(21)-ene 6 leads to the formation of small quantities of various fernenes and of new compounds, the 14-methyl-13,15-cyclo-B':A'-neo-26-nor-14,15-seco-18 alpha-gammacer-7-ene 8 and its Delta(8)- and Delta(9(11))-isomers 9 and 10, the structures of which have been established by MS and NMR spectroscopy. This novel hopane skeleton transposition also operates an bacterial sedimentary hopenes, as shown by GC-MS investigations of the alkene fraction from a recent lacustrine sediment.
Triterpenoids from the fern Goniophlebium mengtzeense
Two new triterpenoids, fern-9(11)-en-20 alpha-yl palmitate and 8 beta H-fern-9(11)-en-7-one were isolated from the fresh fronds of Goniophlebium mengtzeense. Their structures were established by spectroscopic techniques and chemical correlation. Thirty-seven other compounds were identified from this fern. (C) 1997 Published by Elsevier Science Ltd. All rights reserved.