84
Table 7 Samples 1 and 2 of L. hookeri and their chemical constituents
No.
Specimen
number
Collection
place
Elevation
(m)
10H Tricyclic
eremophilanes
Others Ref.
1
a
a
a
215, 220, 221, 223
−
[138]
2
2012-30
Kangding (S) 3900
209, 213, 214, 223
650,
790
[138]
a
Mixture of four samples; 2002-80, 2003-03, 2003-70, 2003-81
3.5 Ligularia atroviolacea (Franchet) Handel-Mazzetti
Three samples of L. atroviolacea were investigated, inclusive of our own work
(Table 8). Sample 1 (Yulong, Yunnan Province, China) produced three
3β- angeloyloxyfuranoeremophilanes (204, 205, and 224) [48], with compounds
204 and 205 being 15-oic acids. As suggested by Bohlmann et al. [288] and Kuroda
et al. [289], 6β-acyloxy-15-oic acid can cyclize to a 15,6α-olide derivative, and thus
many derivatives, such as compounds 211–224, 458–515, 522, 544, and 545, are
known. From sample 2 (Lijiang, Yunnan Province), the bislactones 499–501 and
510 were reported [208]. However, there are many errors evident in this paper; for
example, according to the abstract, five compounds were isolated, but, in the text,
only four compounds were described. The same group published another paper
[146] describing the isolation of 215 and 498 from the same sample as described in
Ref. [208]. It was also stated that compound 215 was a new natural product when
isolated. However, 215 was already known [290] at that time of publication [208].
Moreover, the MS data for 215 were expressed incorrectly (i.e., M = 260, but
Plate 7 Photograph of
L. hookeri
M. Tori and C. Kuroda
Table 7 Samples 1 and 2 of L. hookeri and their chemical constituents
No.
Specimen
number
Collection
place
Elevation
(m)
10H Tricyclic
eremophilanes
Others Ref.
1
a
a
a
215, 220, 221, 223
−
[138]
2
2012-30
Kangding (S) 3900
209, 213, 214, 223
650,
790
[138]
a
Mixture of four samples; 2002-80, 2003-03, 2003-70, 2003-81
3.5 Ligularia atroviolacea (Franchet) Handel-Mazzetti
Three samples of L. atroviolacea were investigated, inclusive of our own work
(Table 8). Sample 1 (Yulong, Yunnan Province, China) produced three
3β- angeloyloxyfuranoeremophilanes (204, 205, and 224) [48], with compounds
204 and 205 being 15-oic acids. As suggested by Bohlmann et al. [288] and Kuroda
et al. [289], 6β-acyloxy-15-oic acid can cyclize to a 15,6α-olide derivative, and thus
many derivatives, such as compounds 211–224, 458–515, 522, 544, and 545, are
known. From sample 2 (Lijiang, Yunnan Province), the bislactones 499–501 and
510 were reported [208]. However, there are many errors evident in this paper; for
example, according to the abstract, five compounds were isolated, but, in the text,
only four compounds were described. The same group published another paper
[146] describing the isolation of 215 and 498 from the same sample as described in
Ref. [208]. It was also stated that compound 215 was a new natural product when
isolated. However, 215 was already known [290] at that time of publication [208].
Moreover, the MS data for 215 were expressed incorrectly (i.e., M = 260, but
Plate 7 Photograph of
L. hookeri
M. Tori and C. Kuroda