PINGUISANE AND SACCULATANE TERPENOIDS FROM THE LIVERWORT PORELLA-PLATYPHYLLA

A new pinguisanoic acid sesquiterpenoid derivative, methyl 2a-hydroxy- 6-oxo-11-pinguisanoate and a new sacculatane diterpenoid hemiacetal, 9 S,10R,13S)-11,13-epoxy-8(12),17-sacculatadiene-13 beta,15 xi-diol [(13 S)-15 xi-hydroxysacculaporellin], have been isolated from the liverwor t Porella platyphylla together with three known pinguisanes and the kn own sacculatane perrottetianal B. Their structures were elucidated fro m their spectroscopic properties. The stereochemistry of one of the kn own pinguisanes, beta-pinguisenediol, has been revised at C-2 and assi gned at C-7. It is suggested that the configuration at C-13 in saccula porellin, a sacculatane hemiacetal reported previously from P. perrott etiana, should be revised from 13R to 13S. Copyright (C) 1996 Elsevier Science Ltd