Isolation and identification of two new polyynes from a North American ethnic medicinal plant-oplopanax horridus (Smith) Miq

Article abstract of DOI:10.3390/molecules15021089

Two new polyynes, named oplopantriol A (5) and oplopantriol B (6), were isolated from the root bark of Oplopanax horridus (Smith) Miq, an ethnic medicinal plant of North America, along with four known polyynes: (3S,8S)-falcarindiol (1), oplopandiol (2), (11S,16S,9Z)-9,17-octadecadiene-12, 14-diyne-1,11,16-triol, 1-acetate (3) and oplopandiol acetate (4). The structures of the new compounds were elucidated by detailed spectroscopic analyses, including 1D and 2D NMR techniques and chemical methods. The absolute configurations of the new compounds 5 and 6 were determined by comparing their optical rotation values with the hydrolysis products of the known compounds 3 and 4, respectively, derived from the same plant. On the basis of an analysis of their physical and chemical properties we show that the alkaline hydrolysis of 3 and 4 afforded the new compounds 5 and 6, respectively.

Full text of DOI:10.3390/molecules15021089

Molecules 2010, 15, 1089-1096; doi:10.3390/molecules15021089
OPEN ACCESS
molecules
ISSN 1420-3049
www.mdpi.com/journal/molecules
Article
Isolation and Identification of Two New Polyynes from a North
American Ethnic Medicinal Plant--Oplopanax horridus (Smith)
Miq.
Wei-Hua Huang 1, Qing-Wen Zhang 1,*, Chong-Zhi Wang 2, Chun-Su Yuan 2 and Shao-Ping Li 1,*
1
Institute of Chinese Medical Sciences, University of Macau, Macao, China;
E-Mail:endeavor34852@yahoo.com.cn (W.-H.H.)
2
Tang Center for Herbal Medicine Research, The Pritzker School of Medicine, University of Chicago,
Chicago, IL 60637, USA; E-Mails: czwang@dacc.uchicago.edu (C.-Z.W.);
CYuan@dacc.uchicago.edu (C.-S.Y.)
* Authors to whom correspondence should be addressed; E-Mails: qwzhang@umac.mo (Q.-W.Z.);
spli@umac.mo (S-P.L.)
Received: 27 December 2009; in revised form: 4 February 2010 / Accepted: 19 February 2010 /
Published: 23 February 2010
Abstract: Two new polyynes, named oplopantriol A (5) and oplopantriol B (6), were
isolated from the root bark of Oplopanax horridus (Smith) Miq, an ethnic medicinal plant of
North America, along with four known polyynes: (3S,8S)-falcarindiol (1), oplopandiol (2),
(11S,16S,9Z)-9,17-octadecadiene-12,14-diyne-1,11,16-triol, 1-acetate (3) and oplopandiol
acetate (4). The structures of the new compounds were elucidated by detailed spectroscopic
analyses, including 1D and 2D NMR techniques and chemical methods. The absolute
configurations of the new compounds 5 and 6 were determined by comparing their optical
rotation values with the hydrolysis products of the known compounds 3 and 4, respectively,
derived from the same plant. On the basis of an analysis of their physical and chemical
properties we show that the alkaline hydrolysis of 3 and 4 afforded the new compounds 5
and 6, respectively.
Keywords: Oplopanax horridus; polyyne; oplopantriol A and B; alkaline hydrolysis

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1. Introduction
Plants of the genus Oplopanax, belonging to the family Araliaceae, comprise three species which are
Oplopanax japonicus (Nakai) Nakai. uniquely found in Japan, Oplopanax elatus Nakai, only distributed
in northeast China, and Oplopanax horridus (Smith) Miq. exclusively originated and grown in North
America [1-3]. These ethnic medicinal herbs were reported to have anti-tuberculosis, antibiotic, lineae
atrophicae relieving, antifungal, anti-psoriasis and anticancer activities [4-9]. O. horridus, commonly
known as Devil’s Club, whose inner bark and roots are used by First Nations peoples for a variety of
ailments such as diabetes, rheumatism, tuberculosis, colds, headaches, and lung hemorrhages [10], was
reported to afford antimycobacterial and antifungal polyyne ingredients [11]. As a part of our research
work on bioactive metabolites from the plants of Oplopanax, phytochemical investigation on O.
horridus was conducted and two new polyynes 5 and 6 were isolated, together with four known
polyynes: (3S,8S)-falcarindiol (1), oplopandiol (2), (11S,16S,9Z)-9,17-octadecadiene-12,14-diyne-
1,11,16 -triol, 1-acetate (3) and oplopandiol acetate (4) (Figure 1) [11]. Although the planar structure of
compound 5 was reported previously, the absolute configuration was not elucidated [12]. The present
paper describes the isolation and structural elucidation of compounds 5 and 6 on the basis of the IR, 1H-
13
and C-NMR, Hydrogen-Hydrogen Correlation Spectroscopy (H-H COSY), Heteronuclear Multiple
Quantum Coherence (HMQC), Heteronuclear Multiple Bond Coherence (HMBC), mass spectroscopic
data and chemical methods.
Figure 1. Structures of compounds 1-6.
9
10
HO
8
3
OH
1
2
( 1 )
( 2 ) 1, 2-dihydro
17
9
10
HO
16
11
OH
18
18
17
( 3 )
( 4 ) 17, 18-dihydro
10
1
O
9
2
HO
O
16
11
OH
( 5 )
17
( 6 ) 17, 18-dihydro
1
2
OH
2. Results and Discussion
By successive column chromatography (CC) on silica gel and octadecyl silica gel (ODS gel) and
prep-HPLC, an 85% ethanol extract of air-dried root bark of O. horridus afforded two new polyynes 5,

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6, along with four known compounds 1-4. The identification of 5 and 6 were made by spectroscopic
data. The absolute configurations of the new compounds 5 and 6 were determined by comparing their
optical rotation values with the hydrolysis products of the known compounds 3 and 4, respectively,
derived from the same plant.
Compound 5 was obtained as a yellowish oil. The molecular formula of 5 was determined to be
C18H26O3 on the basis of the HR-electrospray ionization (ESI)-MS spectrum (m/z 289.1867 [M-H]¯,
Calcd for C18H25O3: 289.1804). The UV (288, 271, 263, and 253 nm) and IR absorptions (2250 and 1675
cm–1) indicated the presence of two C≡C bonds [13]. The 1H-NMR spectrum of 5 displayed signals due
to five olefinic protons at δH 5.93 (ddd, J = 17.4, 10.0, 5.5 Hz), 5.58 (ddt, J = 10.6, 7.3, 1.0 Hz), 5.51 (ddt,
J = 10.6, 8.2, 1.0 Hz), 5.46 (dt, J = 17.4, 1.0 Hz) and 5.22 (dt, J = 10.0, 1.0 Hz), in addition to a
hydroxymethyl group at δH 3.64 (2H, t, J = 6.5 Hz), seven methylene groups at δH 2.11 (2H, tq, J = 7.1,
1.5 Hz), 1.56 (2H, m), 1.39 (2H, m) and 1.31 (8H, m) (Table 1). Analysis of the 13C-NMR and HMQC
spectra revealed the presence of 18 carbons (Table 1), containing seven methylenes carbons (δC
25.6-32.6) and one hydroxymethyl at δC 63.0, four olefinic carbons at δC 136.0, 134.2, 127.9 and 117.1,
four unprotonated acetylenic carbons and two oxygen-bearing sp3 carbons at δC 58.5 and 63.3. All
protonated C-atoms and their corresponding H-atoms were assigned by the HMQC experiments. The
structure elucidation was assisted by analyses of the HMBC experiments (Figure 2). The HMBC
correlations between H-16 (δH 4.93) and C-18 (δC 117.1), C-17 (δC 136.0), C-15 (δC 78.5) and C-14 (δC
70.1) indicated that the hydroxy group was connected to C-16. Furthermore, the correlations between
H-11 (δH 5.19) and C-13 (δC 68.7), C-12 (δC 79.8), C-9 (δC 127.9) and C-10 (δC 134.2) identified that
another hydroxyl group was attached to C-11. The correlations in the H-H COSY spectrum between the
hydroxy methylene at δH 5.19 and olefinic proton at δH 5.58 as well as between the other hydroxy
methylene at δH 4.93 and another olefinic proton at δH 5.93 confirmed above findings. The geometry of
the double bond between C-9 and C-10 was determined to be cis as the alkene bond was fixed to be Z
according to the vicinal coupling constant between H-9 and H-10 (J9,10 = 10.6 Hz). On the basis of these
structural determinations, the planar structure of 5 was established as 9,17-octadecadien-12,14-
diyne-1,11,16-triol. The absolute configuration of compound 5 was not elucidated, but would be
determined together with that of compound 6.
Figure 2. Key HMBC correlations (H → C) of compounds 5 and 6.

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Compound 6 was prepared as yellowish oil. Its molecular formula, C18H28O3, was determined from
the [M-H]¯ peak at 291.1966 (Calcd for C18H27O3: 291.1960), in the HR-ESI-MS spectrum. The UV
(287, 261, 255, and 226 nm) and IR absorptions (2232 and 1656 cm–1) suggested that compound 6 had
the same structural skeleton as compound 5. The 1H and 13C NMR (Table 1) spectra of 6 were similar to
those of 5, except for the appearance of signals for an ethyl group [δH 1.00 (3H, t, J = 7.5 Hz) and 1.74
(2H, m); δC 9.3 and 30.6] and the disappearance of the signals for the terminal double bond [δH 5.52 (1H,
dt, J = 10.0 and 1.0 Hz), 5.46(3H, dt, J = 17.6 and 1.0 Hz) and 5.93 (3H, ddd, J = 17.4, 10.0 and 5.5 Hz);
δC 117.1 and 136.0], suggesting that 6 was a dihydro derivative of 5. In the HMBC spectrum (Figure
2), the correlations between H-16 [δH 4.37(1H, t, J = 6.6 Hz)] and C-17 (δC 30.6), C-18 (δC 9.3), C-15 (δC
80.9) and C-14 (δC 68.8), as well as between H-11 [δH 5.19 (1H, br.d, J = 8.2 Hz)] and C-10 (δC 134.1),
C-9 (δC 128.0), C-12 (δC 79.1) and C-13 (δC 68.8) confirmed the structure as shown in Figure 1. The
geometry of the double bond between C-10 and C-9 was determined to be the same as compound 5 as cis
and Z. According to the above results, the planar structure of 6 was elucidated to be
9-octadecaen-12,14-diyne-1,11,16-triol.
α, β
Table 1. 1H- (500 MHz) and 13C-NMR (125 MHz) data of 5 and 6 in CDCl3
.
compound 5
δH (J in Hz)
compound 6
δH (J in Hz)
Carbon
position
δC
δC
1
2
3
4
5
6
7
8
3.64, t (2H, 6.5 )
1.56, m (2H )
1.31, m (2H)
1.31, m (2H)
1.31, m (2H)
63.0
32.6
25.6
29.1a
29.2
29.0 a
28.8
27.5
3.64, t (2H, 6.5 )
1.57, m ( 2H )
1.31, m (2H)
1.31, m (2H)
1.31, m (2H)
1.31, m (2H)
1.38, m (2H)
2.11, dq (2H, 7.1, 1.5 )
5.52, ddt (1H, 10.6,
8.2, 1.5 )
63.0
32.6
25.6
29.1b
29.2
1.31, m (2H)
1.39, m (2H)
2.11, dq (2H, 7.1, 1.5 )
29.0 b
28.8
27.5
9
5.51, ddt (1H, 10.6, 8.2, 1.5 )
5.58, ddt (1H, 10.6, 7.3, 1.5 )
127.9
134.2
128.0
134.1
5.58, ddt (1H, 10.6,
7.3, 1.5 )
10
11
12
13
14
15
16
17
5.19, d (1H, 8.0)
58.5
79.8
68.7
70.1
78.5
63.3
5.19, br.d (1H, 8.0)
-
58.5
79.1
68.8c
68.8 c
80.9
63.8
30.6
-
-
-
-
-
-
-
4.93, br.d ( 1H, 5.5)
5.93, ddd ( 1H, 17.4, 10.0, 5.5 ) 136.0
4.37, t ( 1H, 6.6)
1.74, m (2H)
5.22, dt ( 1H, 10.0, 1.0 );
5.46, dt ( 1H, 17.4, 1.0 )
18
117.1
1.00, t ( 3H, 7.5)
9.3
α TMS was used as an internal standard in spectra experiments; β Assignments based on HMQC and
HMBC experiments; a-c Assignments may be interchanged.
Alkaline hydrolysis of 3 and 4 afforded their deacetyl derivatives 3a and 4a, respectively, which had
the same retention times as 5 and 6 by Ultra Performance Liquid Chromatography (UPLC) analysis.

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Furthermore, the optical rotation values of 3a {[α]2D5 + 189.3° (c = 0.23, CHCl3)} and 4a {[α]D25 + 230.6°
(c = 0.11, CHCl3)} were identical with those of the new polyynes 5 {[α]2D5 +194.4° (c = 0.16,
CHCl3)}and 6{[α]2D5 + 233.0° (c = 0.3, CHCl3)}, respectively. The above evidence indicated that 5 and 6
should have the same absolute configurations with the known compounds 3 and 4. Thus, the complete
structures of the new polyynes, oplopantriol A (5) and oplopantriol B (6), were elucidated to be
(11S,16S,9Z)-9,17-octadecadien-12,14-diyne-1,11,16-triol and (11S,16S,9Z)-9-octadecaen-12,14-
diyne-1,11,16-triol, which were named as oplopantriol A (5) and oplopantriol B (6), respectively.
Falcarindiol was isolated from several species in Araliaceae, Asteraceae and Apiaceae. The absolute
configuration of falcarindiol from Peucedanum oreoselinum was assigned as (3R,8S) by Lemmich in
1981 on the basis of chemical correlation studies [14], and the same result was obtained by Ratnayake
and Hemscheidt using olefin cross-metathesis for that isolated from Tetraplasandra hawaiiensis [15].
Steroselective synthesis of (3R,8S)-falcarindiol has been reported by Zheng et al. [16] and Sabitha et al.
[17]. The (3S,8S) epimer was also reported by Bernart et al. and Kobaisy et al. from Dendropanax
arboreus [18] and O. horridus [11], respectively. In Mosher’s method, the resonances of falcarindiol
with a (3R,8S)-configuration for protons H-9, H-10, and H-11 all showed negative Δδ (δS – δR)values,
and those of the resonances for H-1E, H-1Z, and H-2 were all positive (the data were extracted from the
supporting materials of reference [15], and was misinterpreted in the text), while that with a
(3S,8S)-configuration had shown all negative Δδ values [18]. The stereochemistry found for polyynes
isolated from Araliaceae with a (3S,8S)-configuration seems to be entirely different from those with the
(3R,8S) stereochemistry reported from Apiaceae and Asteraceae [14, 19-22]. Consequently the four
known polyynes were proposed as (3S,8S)-falcarindiol (1), oplopandiol (2), (11S,16S,9Z)-
9,17-octadecadiene-12,14-diyne-1,11,16-triol, 1-acetate (3) and oplopandiol acetate (4) with a
(3S,8S)-configuration or (11S,16S)-configuration on basis of biosynthesis pathway, optical rotation
values and spectroscopic data with those reported from the same plants.
3. Experimental
3.1. General
Optical rotations were measured on a PerkinElmer Model 341 polarimeter. UV spectra were recorded
on a Beckman Coulter DU 640 spectrophotometer. IR spectra were obtained with a PerkinElmer
Spectrum 100 FT-IR spectrometer with KBr pallets. The 1H-, 13C-, and 2D-NMR spectra were recorded
on a Bruker AV-500 spectrometer at room temperature (δ in ppm, J in Hz) with tetramethylsilane (TMS)
as an internal standard (Bruker, Germany). ESI-MS and HR-ESI-MS measurements were carried out on
an Agilent 1100 series LC/MSD Trap VL mass spectrometer and a Wiff Agilent time-of-flight (TOF)
mass spectrometer respectively (Agilent, USA). Silica gel (100-200 and 200-300 mesh) (Qingdao
Haiyang Chemical Co. Ltd, China) and Alltech Reversed-phase C18 (RP-C18) silica gel (40-63 µm)
(Alltech, USA) were used for column chromatography (CC). Precoated silica gel GF254 plates (Qingdao
Haiyang Chemical Co. Ltd, Qingdao, China) were used for TLC. Supercritical fluid extraction was
manipulated on a supercritical fluid extractor (SFT-250, Supercritical Fluid Technologies, Inc., USA).
Analytical HPLC was performed on an Agilent 1100 liquid chromatograph with an Alltech Alltima
RP-C18 column (250 mm × 4.6 mm inside diameter (I.D.), 5 µm, Alltech, USA). Preparative HPLC was

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carried out with an Agilent 1100 liquid chromatograph with an Alltech Alltima RP-C18 column (250 mm
× 22 mm I.D., 10 µm). Analytical UPLC was performed on Waters Acquity Ultra performance LC
(Waters, Milford, MA), equipped with binary solvent manager, sampler manager, column compartment,
and PDA detector, connected to Waters Empower 2 software, with an Acquity UPLC BEH C18 column
(50 mm × 2.1 mm I.D., 1.7 μm). HPLC-grade methanol was a product of Merck (Merck, Germany). The
deionized water used for HPLC was purified by a Milli-Q purification system (Millipore, USA).
3.2. Plant Material
The dried root bark of O. horridus was collected and authenticated by one of the authors (C.-Z. Wang)
from Chicago,ILof USA in March, 2009. A voucher specimen has been deposited in the Laboratory of
Quality Control, Institute of Chinese Medicine Sciences, University of Macau, Macao, China.
3.3. Extraction and Isolation
After the volatile oil was removed from the air-dried, powdered root bark of O. horridus (10.5 kg) by
supercritical fluid extraction (SFE), the residue (10.2 kg) was extracted by 85% EtOH under refluxing,
and the crude extract (1,900 g) was suspended in water and then extracted successively with petroleum
ether (60-90°C), EtOAc, and n-BuOH to give the corresponding fractions P (124 g), E (570 g) and B
(610 g), respectively. The EtOAc-soluble fraction E (510 g) was separated by silica gel (100–200 mesh)
CC, eluted with a gradient of CHCl3–MeOH (50:1 to 0:1) to give ten fractions (E1–E10). Fraction E7
(82 g) was then subjected to CC of silica gel (200–300 mesh), eluting with CHCl3–MeOH(10:1, 8:1 and
5:1), to give six subfractions (E7a–E7f). Subfraction E7d (50 g) was chromatographed on RP-C18 silica
gel CC (MeOH-H2O, 70:30), then prepared on Prep-HPLC (MeOH-H2O, 78:22) to afford 1 (1.6g) and 2
(2.5 g). Fraction E8 (75 g) was subjected to silica gel (200–300 mesh) CC, eluting with
CHCl3–MeOH(10:1, 6:1 and 4:1), to afford five subfractions (E8a–E8e). Subfraction E8d (45 g) was
chromatographed on RP-C18 silica gel CC (MeOH-H2O, 67:33), then by prep-HPLC (MeOH-H2O,
70:30) to afford 3 (2.6 g) and 4 (3.0 g). Subfraction E9 (68 g) was further separated by CC on silica gel
(200–300 mesh), eluting with CHCl3–MeOH(8:1, 5:1 and 3:1), to yield six subfractions (E9a–E9f).
Subfraction E9e (36 g) was further purified by prep-HPLC (MeOH-H2O, 65:35) to afford 5 (1.8 g) and 6
(2.1 g).
3.4. Alkaline Hydrolysis of Compounds 3 and 4
The polyyne ester compound 3 (21 mg) and compound 4 (22 mg) were each dissolved in 95% ethanol
(1 mL). Then, NaOH (8 mg) was added to each solution, and the mixtures were heated at 60 °C for
4 hours. The mixtures were diluted with H2O (5 mL) and each one was extracted with CHCl3 (6 mL× 3).
The CHCl3 layer was evaporated and the hydrolysis products were subjected to prep-HPLC
(MeOH-H2O, 65:35) to afford 5 (6 mg) and 6 (5 mg), respectively.
Oplopantriol A (5), (11S,16S,9Z)-9,17-octadecadien-12,14-diyne-1,11,16-triol yellowish oil; [α]D25
+194.4° (c = 0.16, CHCl3); UV (CHCl3) λmax (log ξ): 215 (0.63), 226 (1.10), 255 (4.09) 261 (3.95), 273
(4.13) and 287 (4.07) nm; IR (KBr) νmax : 3357, 3022, 2929, 2855, 2251, 2150, 1675, 1464, 1405, 1303,

Molecules 2010, 15
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1
13
1021, 933 and 880 cm-1; H and C NMR data (Table 1); Positive mode ESI-MS m/z: 313 [M+Na]+
(100); Negative mode HR-ESI-MS m/z: 289.1867 [M-H]¯, Calcd for C18H25O3: 289.1804).
Oplopantriol B (6), (11S,16S,9Z)-9-octadecaen-12,14-diyne-1,11,16-triol yellowish oil; [α]2D5 + 233.0°
(c = 0.3, CHCl3); UV(CHCl3) λmax (log ξ): 207 (1.07), 226 (1.19), 232 (1.17), 253 (4.02), 263 (3.98),
265 (3.95), 272 (4.01) and 288 (3.84) nm; IR (KBr) νmax : 3355, 3021, 2930, 2856, 2232, 2143, 1656,
1463, 1305, 1095, 1017, 970 and 866 cm-1; 1H and 13C NMR data (Table 1); Positive mode ESI-MS m/z:
315 [M+Na]+ (100); Negative mode HR-ESI-MS m/z: 291.1966 [M-H]¯, Calcd for C18H27O3:
291.1960).
4. Conclusions
A detailed phytochemical investigation on O. horridus led to the isolation of two new polyynes
(11S,16S,9Z)-9,17-Octadecadien-12,14-diyne-1,11,16-triol and (11S,16S,9Z)-9-octadecaen-12,14-
diyne-1,11,16-triol named oplopantriol A (5) and oplopantriol B (6), along with four known polyynes
(3S,8S)-falcarindiol (1), oplopandiol (2), (11S,16S,9Z)-9,17-octadecadiene-12,14-diyne-1,11,16-triol,
1-acetate (3) and oplopandiol acetate (4).
Acknowledgements
This research was supported by grants from Macao Science and Technology Development Fund
(013/2008/A1 to Q.-W. Zhang) and Research Committee of University of Macau (UL015/09-Y1 to
S.-P. Li)
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Sample Availability: Samples of all the compounds are available from the authors.
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