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
摘要:
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.
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
摘要:
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.