Pinguisane and sacculatane terpenoids from the liverwort Porella platyphylla
1996
Buchanan, M.S. | Connolly, J.D. | Rycroft, D.S.
A new pinguisanoic acid sesquiterpenoid derivative, methyl 2alpha-hydroxy-6-oxo-11-pinguisanoate and a new sacculatane diterpenoid hemiacetal, (5S,9S,10R, 13S)-11,13-epoxy-8(12),17-sacculatadiene-13beta, 15xi-diol [(13S)-15xi-hydroxysacculaporellin], have been isolated from the liverwort Porella platyphylla together with three known pinguisanes and the known sacculatane perrottetianal B. Their structures were elucidated from their spectroscopic properties. The stereochemistry of one of the known pinguisanes, beta-pinguisenediol, has been revised at C-2 and assigned at C-7. It is suggested that the configuration at C-13 in sacculaporellin, a sacculatane hemiacetal reported previously from P. perrottetiana, should be revised from 13R to 13S.
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