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Chem. Pharm. Bull. 50(10) 1390ﾑ1392 (2002)

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Chem. Pharm. Bull. 50(10) 1390ﾑ1392 (2002) 1390 Notes Chem. Pharm. Bull. 50(10) 1390—1392 (2002) Vol. 50, No. 10 New Bibenzyl Cannabinoid from the New Zealand Liverwort Radula marginata a a a b b Masao TOYOTA, Takuji SHIMAMURA, Hikari ISHII, Matt RENNER, John BRAGGINS, and ,a Yoshinori ASAKAWA* a Faculty of Pharmaceutical Sciences, Tokushima Bunri University; Yamashiro-cho, Tokushima 770–8514, Japan: and b Plant Systematics, School of Biological Sciences, University of Auckland; Private Bag 92019, Auckland, New Zealand. Received May 7, 2002; accepted July 22, 2002 The ether extract of the New Zealand liverwort Radula marginata afforded a new cannabinoid type bibenzyl compound named perrottetinenic acid, and two new bibenzyls, together with a known cannabinoid, perrot- tetinene. Their structures were established by two dimensional (2D) NMR spectral data. The structure of perrot- tetinenic acid was a similar to that of D1-tetrahydrocannabinol, a known hallucinogen. Cannabinoid type biben- zyls have been isolated from liverwort Radula perrottetii, though have not previously been reported from the liv- erwort R. marginata. Key words cannabinoid; bibenzyl; liverwort; Radula; chemosystematics We are continuing the chemosystematic study of the liver- hauser enhancement spectroscopy (NOESY spectrum of 1 worts by gas chromatography (GC)- and liquid chromatogra- (Fig. 3) showed correlations between H-3 and 4, confirming phy (LC)-MS analysis, as resolution of the relationships be- the stereochemistry of a cis-fused ring. Consideration of tween species of liverworts is difficult because of their small these spectral data led to the conclusion that the compound size, and ephemeral nature of the sporophytic generation, was perrottetinenic acid (1), although its absolute configura- which yields many conventionally critical taxonomic charac- tion remains to be clarified. It is noteworthy that in this inves- ters. This is particularly true of the genus Radula. This inves- tigation the GC-MS analysis of 1 showed a same retention tigation is part of a chemosystematic study devoted to assist- time and mass spectrum as those of 2 because of decarboxy- ing the resolution of infrageneric relationships within lation of 1 in an injection at 250 °C of GC. Radula. During our investigation of the genus of Radula, we Compound 3 was isolated as a minor constituent of this found the cannabinoid type compound, perrottetinene in the species, the coloration of which showed dark blue with spray 1) Japanese liverwort, Radula perrottetii. Radula species are of FeCl3 on a TLC. The presence of a phenolic hydroxyl very rich sources of aromatic compounds and are extremely group was anticipated. The structure of 3 was deduced by rich in prenylated bibenzyls.2—4) The ether extract of the New comparing its spectral data with those of 2. Whereas the car- Zealand liverwort R. marginata, which have not yet been in- vestigated phytochemically, afforded new cannabinoid type and prenylated bibenzyls. The ether extract of R. marginata was chromatographed on silica gel to give three new aromatic compounds 1, 3 and 4, together with known 2, 5, 6 and d-tocopherol (Fig. 1). 2 Perrottetinenic acid; Compound 1, [a]D 165.8°, showed absorption bands characteristic of a carboxyl group at 2800—3100 and 1615 cm21. The presence of a benzene ring is apparent from UV absorption at 257.4 nm and an intense aromatic absorption at 1566 cm21 in the IR spectrum. The 1H-NMR spectrum (Table 1) of 1 was similar to that of per- rottetinene (2), except for the appearance of a shifted proton signal at d 12.21 (1H, s,) and for the absence of an aromatic signal of 2. Furthermore, five aromatic ring protons at d 7.20 (1H, tt, J51, 8 Hz, H-60), 7.22 (2H, br d, J58, H-40, 80) and 7.30 (2H, br t, J58 Hz, H-50, 70) were observed in the 1H- NMR spectrum of 1, due to a 1-substituted aromatic ring. A 1 fragment peak, tropylium cation (C7H7 ) at m/z 91 in the electron impact (El)-MS of 1 provided further evidence for this aromatic ring. The EI-MS spectrum of 1 showed a mo- lecular ion peak at m/z 392, its constitution of C25H28O4 was confirmed by its high resolution EI-MS measurement. Analysis of the heteronuclear multiple quantum coher- ence (HMQC) and heteronuclear multiple bond correlation (HMBC) spectra (important correlations are summarized in Fig. 2) supports the structural assignment. The nuclear Over- Fig. 1. Structures of Bibenzyls 1—6, Isolated from R. marginata * To whom correspondence should be addressed. e-mail: [email protected] © 2002 Pharmaceutical Society of Japan October 2002 1391 Table 1. NMR Data of Compounds 2—4 in CDCl3 1H 13C No. 2 3 4 234 1 — 2.49, 2.73 (each, dd, 5, 16) 2.77—2.85a) 134.3 28.5 32.1 2 6.33 (br d, 3) 3.73 (br t, 5) 4.19 (dd, 4, 7) 121.8 69.8 79.0 3 3.60 (br s) — — 31.3 76.2 147.1 4 1.79 (ddd, 3, 6, 11) 1.25 (3H, s)d) 4.90 (br t, 1, cis) 39.9 24.5d) 111.3 5.04 (s, trans) 5 1.44 (m, axial), 1.95 (equatorial)a) 1.31 (3H, s)d) 1.83 (br s, 3H) 20.7 22.0d) 17.9 6 1.97—2.02a) (2H) — — 29.6 7 1.70 (3H, s) — — 23.7 8 — — — 77.8 9 1.30 (3H, s) — — 25.3 10 1.43 (3H, s) — — 25.7 19 — 6.21 (d, 2.5) 6.35 (d, 2.5) 110.8 102.0 102.8 29 — — — 158.8 153.7 157.1 39 6.27 (s) — — 112.6 109.6 117.0 49 — — — 145.1 142.6 142.3 59 — 6.34 (d, 2.5) 6.32 (d, 2.5) 102.6 108.8 108.8 69 — — — 165.4 154.9 155.0 10 3.14, 3.19 (each, ddd, 6, 11, 13) 2.78 (2H, dd, 5, 9) 2.77—2.85a 38.7 34.5 35.7 20 2.87, 2.90 (each, ddd, 6, 11, 13) 2.86 (2H, dd, 5, 9) 2.77—2.85a 38.0 36.7 37.7 30 — — — 142.2 141.5 141.5 40 7.22 (br d, 8)b) 7.15 (br d, 8)a) 7.15 (br d, 8)b) 128.4a) 128.4a) 128.4a) 50 7.30 (br t, 8)c) 7.28 (br t, 8)b) 7.29 (br t, 8)c) 128.4a) 128.5b) 128.3b) 60 7.20 (tt, 1, 8) 7.20 (tt, 1, 8) 7.20 (br t, 8) 125.9 126.1 126.1 70 7.30 (br t, 8)c) 7.28 (br t, 8)b) 7.29 (br t, 8)c) 128.4a) 128.5b) 128.3b) 80 7.22 (br d, 8)b) 7.15 (br d, 8)a) 7.15 (br d, 8)b) 128.4a) 128.4a) 128.4a) COOH — 175.1 OH 12.21 (s) — a—c) Overlapped signals. d) Signal assignments may be interchangeable in each column. boxylic acid absorption was missing in the IR spectrum of 3, the presence of a hydroxyl group (3596, 3336 cm21) and an aromatic ring (1618, 1597 cm21) were confirmed. Further ev- idence for the presence of the aromatic ring was provided from the absorption band at 285.8 nm in the UV spectra of 3. The EI-MS spectra of 3 exhibited a molecular ion peak at m/z 298 and tropylium ion peak also observed at m/z 91 same as that in the case of 2. 1H-NMR spectrum of 3 showed methylene protons at d 2.49 and 2.73 (each dd, J55, 16 Hz), Fig. 2. HMBC Correlations for Perrottetinenic Acid (2) which coupled with a methine proton at d 3.73 bearing an oxygenated carbon. The NOESY spectrum of 3 showed a correlation between the methylene protons and benzyl meth- ylene protons at d 2.78, which further correlated with an aro- matic proton at d 6.34 (d, J52.5 Hz, H-59). Analysis of the HMQC and HMBC spectra of 3 supports the structural as- signment. Accordingly, the structure of 3 was elucidated as shown in Fig. 1. Compound 4 was isolated as a minor constituent from this species. The dark blue coloration on tlc with FeCl3 showed the presence of a phenolic hydroxyl group. The IR spectrum of 4 showed the presence of the hydroxyl group at 3598 cm21 and UV spectrum showed the absorption of the aromatic ring at 285.4 nm. The EI-MS spectrum showed a fragment peak at Fig. 3. NOE Correlations for Perrottetinenic Acid (2) m/z 91 and a molecular ion at m/z 298. The 1H-NMR spec- trum of 4 attributed the signals at d 6.32 and 6.35 (each 1H, the signal of methine proton bearing an oxygenated carbon at d, J52.5 Hz, H-59, 19), 7.15 (2H, br d, J58 Hz, H-40, 80), d 4.19 (1H, dd, J54, 7 Hz, H-2) and two proton signals in 7.20 (1H, br t, J58 Hz, H-60) and 7.29 (2H, br t, J58 Hz, H- the overlapping signals at d 2.77—2.85 were observed in the 50, 70) to the same partial structure as compounds 1—3. Fur- 1H–1H COSY spectrum of 4. Analysis of the HMQC and ther resonance proton at d H 2.77—2.85 (6H, overlapping sig- HMBC spectra supported the structural assignment. nals) correlated to three methylene carbons at d C 32.1, 35.7 The absolute configuration of compounds 1—4, isolated and 37.7 in the HMQC spectrum of 4.
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