Studies on the Constituents of the Leaves of Chamaecyparis obtusa var. formosana
Date Issued
2004
Date
2004
Author(s)
Chan, Yi-Fu
DOI
zh-TW
Abstract
Chamaecyparis obtusa var. formosana (Cupressacece) is endemic to Taiwan, distributed at altitudes of 1,300~2,800 meters. The wood of this tree is the best building materials in Taiwan.
The acetone extract from the leaves of C. obtusa var. formosana was concentrated to give a residue which was partitioned between 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 120 compounds. Of these compounds, 21 of them are new (including one novel skeleton) and 3 are isolated for the first time from natural sources. Among the isolated components, there are 21 sesquiterpenoids, 63 diterpenoids, 19 lignoids, 2 steroids, the other 15 do not belong to any of the above categories.
The known compounds were identified by spectral analysis and compared with those reported in literatures or from authentic samples. The structures of new compounds were elucidated by spectral evidence including 1D and 2D techniques.
Subjects
葉部
Leaves
Chamaecyparis obtusa var. formosana
Type
thesis