Studies on the Constituents of the Bark of Taiwania cryptomerioides and the Heartwood of Chamaecyparis obtusa var. formosana
Date Issued
2004
Date
2004
Author(s)
Chien, Shih-Chang
DOI
zh-TW
Abstract
Taiwania cryptomerioides Hayata is indigenous to the central part of Taiwan at altitudes of 1800~2600 meters. The wood of this tree is one of the best building materials in Taiwan.
The acetone extract from the bark of Taiwania cryptomerioides Hayata was concentrated to give a residue, which was partitioned by ethyl acetate and water. The ethyl acetate layer was separated by column chromatography on silica gel, preparative thin layer chromatography and high performance liquid chromatography (HPLC) to give 57 compounds. From these, 42 components are novel or new. The total compounds included 39 diterpenoids, 10 lignoids, 6 aromatics and 2 dimers.
Only two endemic species, Chamaecyparis formosana and C. obtusa var. formosana, of genus Chamaecyparis are found in the central mountains of Taiwan. They are all huge trees and can live for over a thousand year.
The acetone extract from the heartwood of C. obtusa var. formosana was concentrated to give a residue, which was partitioned with ethyl acetate and water. The ethyl acetate layer was dried and then separated by column chromatography on silica gel, preparative thin layer chromatography and high performance liquid chromatography (HPLC) to yield 55 compounds. From these, 22 components are novel or new. The total compounds included 11 monoterpenoids, 18 sesquiterpenoids, 11 diterpenoids, 11 lignoids and 4 aromatics.
The known compounds are identified by spectral analysis and compared with those reported in literatures or authentic samples. The structures of new compounds were elucidated by spectral evidence and chemical methods.
Subjects
天然物
Taiwania cryptomerioides
Chamaecyparis obtusa var. formosana
natural products
Type
thesis
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