165
Our past research has suggested that the three species in the Hengduan Mountains
area form a complex in which at least two chemical lineages, a benzofuran type and
a furanoeremophilane type, are represented [37]. However, analysis of the literature
indicates that the chemical diversity of this complex in eastern Asia is much higher
than our own observations have shown.
3.24 Ligularia cyathiceps Handel-Mazzetti
According to our data from the field, L. cyathiceps is distributed only within a limited area, near Shangri-La City, Yunnan Province, China (Plate 17). We analyzed
seventeen samples (Table 29) and found that the species is almost uniform both in
terms of its chemical composition and ITS sequences [17]. The major components
found were the 1,10-epoxyfuranoeremophilan-9-ones 304, 305, 306, and 308.
Related
furanoeremophilan-9-ones
(183,
280,
and
283)
and
1,10- epoxyfuranoeremophilanes (288, 289, and 293) were also isolated, together
with cacalol (316) and its derivatives 319, 322, and 323. Compound 330, a furanoeremophilane artifact, also was obtained. Other minor components, inclusive of
eremophilanes (1, 13, and 536), a eudesmane (793), and phenylpropanoids (923 and
979), were also isolated [17, 38].
Plate 17 Photograph of
L. cyathiceps
Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity…
Our past research has suggested that the three species in the Hengduan Mountains
area form a complex in which at least two chemical lineages, a benzofuran type and
a furanoeremophilane type, are represented [37]. However, analysis of the literature
indicates that the chemical diversity of this complex in eastern Asia is much higher
than our own observations have shown.
3.24 Ligularia cyathiceps Handel-Mazzetti
According to our data from the field, L. cyathiceps is distributed only within a limited area, near Shangri-La City, Yunnan Province, China (Plate 17). We analyzed
seventeen samples (Table 29) and found that the species is almost uniform both in
terms of its chemical composition and ITS sequences [17]. The major components
found were the 1,10-epoxyfuranoeremophilan-9-ones 304, 305, 306, and 308.
Related
furanoeremophilan-9-ones
(183,
280,
and
283)
and
1,10- epoxyfuranoeremophilanes (288, 289, and 293) were also isolated, together
with cacalol (316) and its derivatives 319, 322, and 323. Compound 330, a furanoeremophilane artifact, also was obtained. Other minor components, inclusive of
eremophilanes (1, 13, and 536), a eudesmane (793), and phenylpropanoids (923 and
979), were also isolated [17, 38].
Plate 17 Photograph of
L. cyathiceps
Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity…