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Paper | Special issue | Vol 59, No. 2, 2003, pp.645-659
Published online, 1st January, 1970
DOI: 10.3987/COM-02-S67
Structures of Two New Highly Oxygenated Labdane-Type Diterpenoids and a New Cadinane-Type Sesquiterpenoid Possessing a Cyclic Ether Linkage from the Liverwort Ptychanthus striatus

Toshihiro Hashimoto, Shigeru Takaoka, Masami Tanaka, and Yoshinori Asakawa*

*Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 180 Nishihamabouji, Yamashiro-machi, Tokushima, 770-8514, Japan


As a part of our systematic investigation of biologically active substances of liverworts, we studied the chemical constituents of the liverwort Ptychanthus striatus belonging to the Lejeuneaceae family, and isolated two novel labdane-type diterpenoids, named ptychantins J and K, and a new cadinane-type sesquiterpene possessing a cyclic ether linkage. Their relative structures were determined by a combination of high resolution NMR spectrometry, X-Ray crystallographic analysis and chemical degradations.